[PATCH] blk: unplug later

get_request_wait needn't unplug the device immediately.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 1e84715..fd94ea2 100644 (file)
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -1969,7 +1969,6 @@ static struct request *get_request_wait(request_queue_t *q, int rw)
        DEFINE_WAIT(wait);
        struct request *rq;
 
-       generic_unplug_device(q);
        do {
                struct request_list *rl = &q->rq;
 
@@ -1981,6 +1980,7 @@ static struct request *get_request_wait(request_queue_t *q, int rw)
                if (!rq) {
                        struct io_context *ioc;
 
+                       generic_unplug_device(q);
                        io_schedule();
 
                        /*