char: replace qemu_chr_claim/release with qemu_chr_fe_init/deinit
Now that all front end use qemu_chr_fe_init(), we can move chardev claiming in init(), and add a function deinit() to release the chardev and cleanup handlers. The qemu_chr_fe_claim_no_fail() for property are gone, since the property will raise an error instead. In other cases, where there is already an error path, an error is raised instead. Finally, other cases are handled by &error_abort in qemu_chr_fe_init(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-19-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
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5d300164d0
commit
c39860e6dc
@ -100,10 +100,6 @@ static void rng_egd_opened(RngBackend *b, Error **errp)
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"Device '%s' not found", s->chr_name);
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return;
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}
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if (qemu_chr_fe_claim(chr) != 0) {
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error_setg(errp, QERR_DEVICE_IN_USE, s->chr_name);
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return;
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}
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if (!qemu_chr_fe_init(&s->chr, chr, errp)) {
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return;
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}
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@ -149,11 +145,7 @@ static void rng_egd_finalize(Object *obj)
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{
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RngEgd *s = RNG_EGD(obj);
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if (s->chr.chr) {
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qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr.chr);
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}
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qemu_chr_fe_deinit(&s->chr);
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g_free(s->chr_name);
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}
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@ -1494,6 +1494,7 @@ void gdb_exit(CPUArchState *env, int code)
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put_packet(s, buf);
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#ifndef CONFIG_USER_ONLY
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qemu_chr_fe_deinit(&s->chr);
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qemu_chr_delete(chr);
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#endif
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}
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@ -1752,8 +1753,6 @@ int gdbserver_start(const char *device)
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chr = qemu_chr_new_noreplay("gdb", device);
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if (!chr)
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return -1;
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qemu_chr_fe_claim_no_fail(chr);
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}
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s = gdbserver_state;
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@ -1976,7 +1976,6 @@ static void pxa2xx_fir_realize(DeviceState *dev, Error **errp)
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PXA2xxFIrState *s = PXA2XX_FIR(dev);
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if (s->chr.chr) {
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qemu_chr_fe_claim_no_fail(s->chr.chr);
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qemu_chr_fe_set_handlers(&s->chr, pxa2xx_fir_is_empty,
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pxa2xx_fir_rx, pxa2xx_fir_event, s, NULL);
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}
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@ -285,7 +285,6 @@ void *mcf_uart_init(qemu_irq irq, CharDriverState *chr)
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s->irq = irq;
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if (chr) {
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qemu_chr_fe_init(&s->chr, chr, &error_abort);
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qemu_chr_fe_claim_no_fail(chr);
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qemu_chr_fe_set_handlers(&s->chr, mcf_uart_can_receive,
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mcf_uart_receive, mcf_uart_event, s, NULL);
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}
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@ -905,7 +905,7 @@ void serial_realize_core(SerialState *s, Error **errp)
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void serial_exit_core(SerialState *s)
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{
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qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_deinit(&s->chr);
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qemu_unregister_reset(serial_reset, s);
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}
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@ -397,7 +397,6 @@ void sh_serial_init(MemoryRegion *sysmem,
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memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
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if (chr) {
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qemu_chr_fe_claim_no_fail(chr);
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qemu_chr_fe_init(&s->chr, chr, &error_abort);
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qemu_chr_fe_set_handlers(&s->chr, sh_serial_can_receive1,
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sh_serial_receive1,
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@ -245,15 +245,8 @@ static int con_initialise(struct XenDevice *xendev)
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xen_be_bind_evtchn(&con->xendev);
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if (con->chr.chr) {
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if (qemu_chr_fe_claim(con->chr.chr) == 0) {
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qemu_chr_fe_set_handlers(&con->chr, xencons_can_receive,
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xencons_receive, NULL, con, NULL);
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} else {
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xen_be_printf(xendev, 0,
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"xen_console_init error chardev %s already used\n",
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con->chr.chr->label);
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con->chr.chr = NULL;
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}
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}
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xen_be_printf(xendev, 1, "ring mfn %d, remote port %d, local port %d, limit %zd\n",
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@ -268,10 +261,7 @@ static void con_disconnect(struct XenDevice *xendev)
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{
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struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
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if (con->chr.chr) {
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qemu_chr_fe_set_handlers(&con->chr, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(con->chr.chr);
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}
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qemu_chr_fe_deinit(&con->chr);
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xen_be_unbind_evtchn(&con->xendev);
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if (con->sring) {
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@ -206,13 +206,12 @@ static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
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object_get_typename(obj), prop->name, str);
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return;
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}
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if (qemu_chr_fe_claim(s) != 0) {
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error_setg(errp, "Property '%s.%s' can't take value '%s', it's in use",
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if (!qemu_chr_fe_init(be, s, errp)) {
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error_prepend(errp, "Property '%s.%s' can't take value '%s': ",
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object_get_typename(obj), prop->name, str);
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return;
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}
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qemu_chr_fe_init(be, s, errp);
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}
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static void release_chr(Object *obj, const char *name, void *opaque)
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@ -221,10 +220,7 @@ static void release_chr(Object *obj, const char *name, void *opaque)
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Property *prop = opaque;
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CharBackend *be = qdev_get_prop_ptr(dev, prop);
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if (be->chr) {
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qemu_chr_fe_set_handlers(be, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(be->chr);
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}
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qemu_chr_fe_deinit(be);
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}
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PropertyInfo qdev_prop_chr = {
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@ -266,6 +266,7 @@ static void ccid_card_vscard_drop_connection(PassthruState *card)
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{
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CharDriverState *chr = qemu_chr_fe_get_driver(&card->cs);
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qemu_chr_fe_deinit(&card->cs);
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qemu_chr_delete(chr);
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card->vscard_in_pos = card->vscard_in_hdr = 0;
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}
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@ -1430,9 +1430,9 @@ static void usbredir_handle_destroy(USBDevice *udev)
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USBRedirDevice *dev = USB_REDIRECT(udev);
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CharDriverState *chr = qemu_chr_fe_get_driver(&dev->cs);
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qemu_chr_fe_deinit(&dev->cs);
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qemu_chr_delete(chr);
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dev->cs.chr = NULL;
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/* Note must be done after qemu_chr_close, as that causes a close event */
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qemu_bh_delete(dev->chardev_close_bh);
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qemu_bh_delete(dev->device_reject_bh);
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@ -361,35 +361,6 @@ int qemu_chr_fe_get_msgfds(CharBackend *be, int *fds, int num);
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*/
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int qemu_chr_fe_set_msgfds(CharBackend *be, int *fds, int num);
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/**
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* @qemu_chr_fe_claim:
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*
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* Claim a backend before using it, should be called before calling
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* qemu_chr_fe_set_handlers().
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*
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* Returns: -1 if the backend is already in use by another frontend, 0 on
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* success.
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*/
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int qemu_chr_fe_claim(CharDriverState *s);
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/**
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* @qemu_chr_fe_claim_no_fail:
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*
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* Like qemu_chr_fe_claim, but will exit qemu with an error when the
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* backend is already in use.
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*/
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void qemu_chr_fe_claim_no_fail(CharDriverState *s);
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/**
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* @qemu_chr_fe_release:
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*
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* Release a backend for use by another frontend.
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*
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* Returns: -1 if the backend is already in use by another frontend, 0 on
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* success.
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*/
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void qemu_chr_fe_release(CharDriverState *s);
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/**
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* @qemu_chr_be_can_write:
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*
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@ -437,7 +408,8 @@ void qemu_chr_be_event(CharDriverState *s, int event);
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* @qemu_chr_fe_init:
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*
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* Initializes a front end for the given CharBackend and
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* CharDriver.
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* CharDriver. Call qemu_chr_fe_deinit() to remove the association and
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* release the driver.
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*
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* Returns: false on error.
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*/
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@ -450,6 +422,13 @@ bool qemu_chr_fe_init(CharBackend *b, CharDriverState *s, Error **errp);
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*/
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CharDriverState *qemu_chr_fe_get_driver(CharBackend *be);
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/**
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* @qemu_chr_fe_deinit:
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*
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* Dissociate the CharBackend from the CharDriver.
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*/
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void qemu_chr_fe_deinit(CharBackend *b);
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/**
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* @qemu_chr_fe_set_handlers:
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* @b: a CharBackend
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@ -582,9 +582,7 @@ static void monitor_data_init(Monitor *mon)
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static void monitor_data_destroy(Monitor *mon)
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{
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if (mon->chr.chr) {
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qemu_chr_fe_set_handlers(&mon->chr, NULL, NULL, NULL, NULL, NULL);
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}
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qemu_chr_fe_deinit(&mon->chr);
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if (monitor_is_qmp(mon)) {
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json_message_parser_destroy(&mon->qmp.parser);
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}
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@ -590,12 +590,6 @@ static int find_and_check_chardev(CharDriverState **chr,
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return 1;
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}
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if (qemu_chr_fe_claim(*chr) < 0) {
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error_setg(errp, "chardev \"%s\" cannot be claimed",
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chr_name);
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return 1;
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}
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return 0;
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}
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@ -707,17 +701,9 @@ static void colo_compare_finalize(Object *obj)
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{
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CompareState *s = COLO_COMPARE(obj);
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if (s->chr_pri_in.chr) {
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qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr_pri_in.chr);
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}
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if (s->chr_sec_in.chr) {
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qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr_sec_in.chr);
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}
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if (s->chr_out.chr) {
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qemu_chr_fe_release(s->chr_out.chr);
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}
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qemu_chr_fe_deinit(&s->chr_pri_in);
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qemu_chr_fe_deinit(&s->chr_sec_in);
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qemu_chr_fe_deinit(&s->chr_out);
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g_queue_free(&s->conn_list);
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@ -175,22 +175,15 @@ static void filter_mirror_cleanup(NetFilterState *nf)
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{
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MirrorState *s = FILTER_MIRROR(nf);
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if (s->chr_out.chr) {
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qemu_chr_fe_release(s->chr_out.chr);
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}
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qemu_chr_fe_deinit(&s->chr_out);
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}
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static void filter_redirector_cleanup(NetFilterState *nf)
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{
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MirrorState *s = FILTER_REDIRECTOR(nf);
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if (s->chr_in.chr) {
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qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr_in.chr);
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}
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if (s->chr_out.chr) {
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qemu_chr_fe_release(s->chr_out.chr);
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}
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qemu_chr_fe_deinit(&s->chr_in);
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qemu_chr_fe_deinit(&s->chr_out);
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}
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static void filter_mirror_setup(NetFilterState *nf, Error **errp)
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@ -211,11 +204,6 @@ static void filter_mirror_setup(NetFilterState *nf, Error **errp)
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return;
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}
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if (qemu_chr_fe_claim(chr) != 0) {
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error_setg(errp, QERR_DEVICE_IN_USE, s->outdev);
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return;
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}
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qemu_chr_fe_init(&s->chr_out, chr, errp);
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}
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@ -254,7 +242,6 @@ static void filter_redirector_setup(NetFilterState *nf, Error **errp)
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return;
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}
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qemu_chr_fe_claim_no_fail(chr);
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if (!qemu_chr_fe_init(&s->chr_in, chr, errp)) {
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return;
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}
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@ -271,7 +258,6 @@ static void filter_redirector_setup(NetFilterState *nf, Error **errp)
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"OUT Device '%s' not found", s->outdev);
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return;
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}
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qemu_chr_fe_claim_no_fail(chr);
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if (!qemu_chr_fe_init(&s->chr_out, chr, errp)) {
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return;
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}
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@ -774,7 +774,6 @@ static int slirp_guestfwd(SlirpState *s, const char *config_str,
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fwd->port = port;
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fwd->slirp = s->slirp;
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qemu_chr_fe_claim_no_fail(fwd->hd.chr);
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qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
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NULL, fwd, NULL);
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}
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@ -150,10 +150,8 @@ static void vhost_user_cleanup(NetClientState *nc)
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g_free(s->vhost_net);
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s->vhost_net = NULL;
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}
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if (nc->queue_index == 0 && s->chr.chr) {
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qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr.chr);
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s->chr.chr = NULL;
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if (nc->queue_index == 0) {
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qemu_chr_fe_deinit(&s->chr);
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}
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qemu_purge_queued_packets(nc);
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@ -297,8 +295,6 @@ static CharDriverState *net_vhost_claim_chardev(
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return NULL;
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}
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qemu_chr_fe_claim_no_fail(chr);
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return chr;
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}
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36
qemu-char.c
36
qemu-char.c
@ -776,6 +776,7 @@ static void mux_chr_close(struct CharDriverState *chr)
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{
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MuxDriver *d = chr->opaque;
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qemu_chr_fe_deinit(&d->chr);
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g_free(d);
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}
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@ -884,6 +885,17 @@ bool qemu_chr_fe_init(CharBackend *b, CharDriverState *s, Error **errp)
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return true;
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}
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void qemu_chr_fe_deinit(CharBackend *b)
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{
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assert(b);
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if (b->chr) {
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qemu_chr_fe_set_handlers(b, NULL, NULL, NULL, NULL, NULL);
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b->chr->avail_connections++;
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b->chr = NULL;
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}
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}
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void qemu_chr_fe_set_handlers(CharBackend *b,
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IOCanReadHandler *fd_can_read,
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IOReadHandler *fd_read,
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@ -4114,7 +4126,6 @@ CharDriverState *qemu_chr_new_noreplay(const char *label, const char *filename)
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error_report_err(err);
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}
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if (chr && qemu_opt_get_bool(opts, "mux", 0)) {
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qemu_chr_fe_claim_no_fail(chr);
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monitor_init(chr, MONITOR_USE_READLINE);
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}
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qemu_opts_del(opts);
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@ -4190,29 +4201,6 @@ guint qemu_chr_fe_add_watch(CharBackend *be, GIOCondition cond,
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return tag;
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}
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int qemu_chr_fe_claim(CharDriverState *s)
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{
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if (s->avail_connections < 1) {
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return -1;
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}
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s->avail_connections--;
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return 0;
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}
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void qemu_chr_fe_claim_no_fail(CharDriverState *s)
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{
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if (qemu_chr_fe_claim(s) != 0) {
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fprintf(stderr, "%s: error chardev \"%s\" already used\n",
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__func__, s->label);
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exit(1);
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}
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}
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void qemu_chr_fe_release(CharDriverState *s)
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{
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s->avail_connections++;
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}
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void qemu_chr_fe_disconnect(CharBackend *be)
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{
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CharDriverState *chr = be->chr;
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@ -490,6 +490,7 @@ static gboolean _test_server_free(TestServer *server)
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int i;
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CharDriverState *chr = qemu_chr_fe_get_driver(&server->chr);
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qemu_chr_fe_deinit(&server->chr);
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qemu_chr_delete(chr);
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for (i = 0; i < server->fds_num; i++) {
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