From 3bfecee2cb71f21cd39d6183f18b446c01917573 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Fri, 19 May 2017 14:04:28 +0200 Subject: [PATCH] ehci: fix frame timer invocation. ehci registers ehci_frame_timer as both timer and bottom half, which turned out to be a bad idea as it can be called as bottom half then while it is running as timer, and it isn't prepared to handle recursive calls. Change the timer func to just schedule the bottom half to avoid this. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1449609 Signed-off-by: Gerd Hoffmann Message-id: 20170519120428.25981-1-kraxel@redhat.com --- hw/usb/hcd-ehci.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index d7361e570f..17c572c55f 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -2232,7 +2232,7 @@ static void ehci_update_frindex(EHCIState *ehci, int uframes) ehci->frindex = (ehci->frindex + uframes) % 0x4000; } -static void ehci_frame_timer(void *opaque) +static void ehci_work_bh(void *opaque) { EHCIState *ehci = opaque; int need_timer = 0; @@ -2324,6 +2324,13 @@ static void ehci_frame_timer(void *opaque) } } +static void ehci_work_timer(void *opaque) +{ + EHCIState *ehci = opaque; + + qemu_bh_schedule(ehci->async_bh); +} + static const MemoryRegionOps ehci_mmio_caps_ops = { .read = ehci_caps_read, .write = ehci_caps_write, @@ -2478,8 +2485,8 @@ void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp) s->ports[i].dev = 0; } - s->frame_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ehci_frame_timer, s); - s->async_bh = qemu_bh_new(ehci_frame_timer, s); + s->frame_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ehci_work_timer, s); + s->async_bh = qemu_bh_new(ehci_work_bh, s); s->device = dev; s->vmstate = qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);