Uwe Kleine-König 3b16600e1f serial: imx: fix a race condition in receive path ... commit 101aa46bd2 upstream. The main irq handler function starts by first masking disabled interrupts in the status register values to ensure to only handle enabled interrupts. This is important as when the RX path in the hardware is disabled reading the RX fifo results in an external abort. This checking must be done under the port lock, otherwise the following can happen: CPU1 | CPU2 | irq triggers as there are chars | in the RX fifo | | grab port lock imx_uart_int finds RRDY enabled | and calls imx_uart_rxint which | has to wait for port lock | | disable RX (e.g. because we're | using RS485 with !RX_DURING_TX) | | release port lock read from RX fifo with RX | disabled => exception | So take the port lock only once in imx_uart_int() instead of in the functions called from there. Reported-by: Andre Renaud <arenaud@designa-electronics.com> Cc: stable@vger.kernel.org Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20200121071702.20150-1-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-02-01 09:34:34 +00:00
..
hvc	…
ipwireless	…
serdev	serdev: Don't claim unsupported ACPI serial devices	2020-01-14 20:08:32 +01:00
serial	serial: imx: fix a race condition in receive path	2020-02-01 09:34:34 +00:00
vt	vcs: prevent write access to vcsu devices	2019-12-13 08:43:22 +01:00
Kconfig	…
Makefile	…
amiserial.c	…
cyclades.c	…
ehv_bytechan.c	…
goldfish.c	…
isicom.c	…
mips_ejtag_fdc.c	…
moxa.c	…
moxa.h	…
mxser.c	…
mxser.h	…
n_gsm.c	…
n_hdlc.c	tty: n_hdlc: fix build on SPARC	2019-10-04 15:14:20 +02:00
n_null.c	…
n_r3964.c	…
n_tracerouter.c	…
n_tracesink.c	…
n_tracesink.h	…
n_tty.c	…
nozomi.c	…
pty.c	…
rocket.c	…
rocket.h	…
rocket_int.h	…
synclink.c	…
synclink_gt.c	…
synclinkmp.c	…
sysrq.c	…
tty_audit.c	…
tty_baudrate.c	…
tty_buffer.c	…
tty_io.c	…
tty_ioctl.c	…
tty_jobctrl.c	…
tty_ldisc.c	…
tty_ldsem.c	…
tty_mutex.c	…
tty_port.c	tty: always relink the port	2020-01-14 20:08:33 +01:00
ttynull.c	…
vcc.c	…