Messages in this thread Patch in this message | | | From | Nicolas Ferre <> | Subject | [PATCH 3/4] tty/serial: at91: prevent null dereference in tasklet function | Date | Tue, 7 Jan 2014 11:45:08 +0100 |
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From: Marek Roszko <mark.roszko@gmail.com>
Something asks a tasklet to be scheduled when the uart port is closed. Need to supress the kernel panic for now by checking if the port is NULL or not.
Signed-off-by: Marek Roszko <mark.roszko@gmail.com> Acked-by: Leilei Zhao <leilei.zhao@atmel.com> Cc: <stable@vger.kernel.org> # v3.12 Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> --- drivers/tty/serial/atmel_serial.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index c421d11b3d4c..6e68486c83cb 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1360,6 +1360,10 @@ static void atmel_tasklet_func(unsigned long data) unsigned int status; unsigned int status_change; + if(!port->state || !port->state->port.tty) + /* uart has been closed */ + return; + /* The interrupt handler does not take the lock */ spin_lock(&port->lock); -- 1.8.2.2
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