tree 653e92ba3b9b19cbfe0d86d64d573eab7886b193
parent 975e046cc06005bafe0c5ce81d55a1b1eb84f5a1
author Ken Chen <kenneth.w.chen@intel.com> 1113690343 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1113690343 -0700

[PATCH] use cheaper elv_queue_empty when unplug a device

In function __generic_unplug_device(), kernel can use a cheaper function
elv_queue_empty() instead of more expensive elv_next_request to find
whether the queue is empty or not.  blk_run_queue can also made conditional
on whether queue's emptiness before calling request_fn().

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>