From fd782a4a99d2d3e818b9465c427b10f7f027d7da Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Wed, 29 Jun 2005 15:15:40 +0100 Subject: [PATCH] [PATCH] Fix get_request nastiness get_request is now expected to be holding on to queue_lock, with interrupts disabled, when it returns NULL; but one path forgot that, causing all kinds of nastiness under swap load - badness backtraces, strange failures, BUGs. Signed-off-by: Hugh Dickins Signed-off-by: Linus Torvalds --- drivers/block/ll_rw_blk.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index 1197462bb6ba..692a5fced76e 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -1917,10 +1917,9 @@ static struct request *get_request(request_queue_t *q, int rw, struct bio *bio, * limit of requests, otherwise we could have thousands of requests * allocated with any setting of ->nr_requests */ - if (rl->count[rw] >= (3 * q->nr_requests / 2)) { - spin_unlock_irq(q->queue_lock); + if (rl->count[rw] >= (3 * q->nr_requests / 2)) goto out; - } + rl->count[rw]++; rl->starved[rw] = 0; if (rl->count[rw] >= queue_congestion_on_threshold(q)) -- GitLab