tree b0928bdda2320b4ac81b4f350aed9d0006efc732
parent 817794e0df5fea495396c18878804044436832be
author Carlos Sanchez <carlos.sanchez@gecoinc.com> 1185867539 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1185921581 -0700

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>