tree d716ae7dc2e986b36c8180333839312dc0eab7e2
parent f7c80c9f77b0e8a59a19506fd3caf323408a5166
author Jens Axboe <axboe@suse.de> 1123006082 +0200
committer Linus Torvalds <torvalds@g5.osdl.org> 1123006758 -0700

[PATCH] cfq-iosched: fix problem with barriers and max_depth == 1

CFQ will currently stall when using write barriers and the default
max_depth setting of 1, since we artificially need a depth of 2 when
pre-pending the first flush. So never deny the barrier request going to
the device.

This is a regression since 2.6.12, it was found in SUSE testing.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>