From: Hugh Dickins Date: Wed, 29 Jun 2005 14:15:40 +0000 (+0100) Subject: [PATCH] Fix get_request nastiness X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fd782a4a99d2d3e818b9465c427b10f7f027d7da;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [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 --- 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 @@ get_rq: * 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))