tree 8a3dccb3a8b82de52bb9a6356766d143ab2edd20
parent 4d9628a1486658b83e47ad4c7ff07ff1ff0d3d89
author Leilei Zhao <leilei.zhao@atmel.com> 1425024438 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1425696707 +0100

tty/serial: at91: correct the usage of tasklet

The tasklet may be scheduled and executed after serial port
was shutdown, for example, DMA rx callback will schedule the
tasklet while serial port is shutting down, especially serial
port is sending and receiving data in a higher baud rate and
it's killed by external program. In this case, tasklet_kill
can only clear the current scheduling out, so tasklet should
be disabled to prevent being executed in later scheduling.
Otherwise, the tasklet executed after serial port was shutdown
can lead to kernel crash.

Signed-off-by: Leilei Zhao <leilei.zhao@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>