Jens Axboe wrote:
On Tue, Mar 29 2005, Nick Piggin wrote:
@@ -2577,19 +2577,18 @@ static int __make_request(request_queue_
spin_lock_prefetch(q->queue_lock);
barrier = bio_barrier(bio);
- if (barrier && (q->ordered == QUEUE_ORDERED_NONE)) {
+ if (unlikely(barrier) && (q->ordered == QUEUE_ORDERED_NONE)) {
err = -EOPNOTSUPP;
goto end_io;
}
-again:
spin_lock_irq(q->queue_lock);
if (elv_queue_empty(q)) {
blk_plug_device(q);
goto get_rq;
}
This should just goto get_rq, the plug should happen only at the end
where you did add it:
Yes I see. I'll fix that up.
@@ -2693,10 +2675,11 @@ get_rq:
req->rq_disk = bio->bi_bdev->bd_disk;
req->start_time = jiffies;
+ spin_lock_irq(q->queue_lock);
+ if (elv_queue_empty(q))
+ blk_plug_device(q);
add_request(q, req);
out:
- if (freereq)
- __blk_put_request(q, freereq);
if (bio_sync(bio))
__generic_unplug_device(q);
-
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