serial: MPSC: Remove race between Rx stop & restart
authorCarlos Sanchez <carlos.sanchez@gecoinc.com>
Tue, 31 Jul 2007 07:38:59 +0000 (00:38 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 31 Jul 2007 22:39:41 +0000 (15:39 -0700)
commit6c1ead5e77c4e41d58ae6e6c3285ad38275df4a8
treeb0928bdda2320b4ac81b4f350aed9d0006efc732
parent817794e0df5fea495396c18878804044436832be
serial: MPSC: Remove race between Rx stop & restart

The patch in commit ID f7232056bff5fe2d3bfeab35252a66ebaeb5bbde stops (aborts)
the MPSC's receive engine just before restarting it.  Unfortunately, it
doesn't wait for the abort to complete before restarting it which creates a
race between the abort and the restart.  If the restart occurs first, the
in-progress abort stops it again and the rx engine remains stopped.

Instead, do the abort when the SDMA engine is being stopped.  Make sure to
wait for the abort to complete before continuing.

Signed-off-by: Carlos Sanchez <carlos.sanchez@gecoinc.com>
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/serial/mpsc.c