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block: Move the second call to get_request to the end of the loop

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In function get_request_wait, the second call to get_request could be
moved to the end of the while loop, because if the first call to
get_request fails, the second call will fail without sleep.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Zhang, Yanmin 2008-05-22 15:13:29 +02:00 committed by Jens Axboe
parent ca39d651d1
commit 05caf8dbc1
1 changed files with 17 additions and 20 deletions
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11
block/blk-core.c
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@ -806,16 +806,12 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
rq = get_request(q, rw_flags, bio, GFP_NOIO);
while (!rq) {
DEFINE_WAIT(wait);
struct io_context *ioc;
struct request_list *rl = &q->rq;
prepare_to_wait_exclusive(&rl->wait[rw], &wait,
TASK_UNINTERRUPTIBLE);
rq = get_request(q, rw_flags, bio, GFP_NOIO);
if (!rq) {
struct io_context *ioc;
blk_add_trace_generic(q, bio, rw, BLK_TA_SLEEPRQ);
__generic_unplug_device(q);
@ -832,9 +828,10 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
ioc_set_batching(q, ioc);
spin_lock_irq(q->queue_lock);
}
finish_wait(&rl->wait[rw], &wait);
}
rq = get_request(q, rw_flags, bio, GFP_NOIO);
};
return rq;
}