atmel_serial: fix spinlock lockup in RS485 code
Patch to fix a spinlock lockup in the driver that sometimes happens when the tasklet starts. Signed-off-by:Claudio Scordino <claudio@evidence.eu.com> Signed-off-by:
Dave Bender <codehero@gmail.com> Tested-by:
Dave Bender <codehero@gmail.com> Acked-by:
Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by:
Alan Cox <alan@linux.intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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