From: Richard Weinberger <richard@nod.at>
To: dedekind1@gmail.com
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Richard Weinberger <richard@nod.at>
Subject: [PATCH] UBI: Fix livelock in produce_free_peb()
Date: Fri, 19 Sep 2014 17:37:56 +0200 [thread overview]
Message-ID: <1411141076-21489-1-git-send-email-richard@nod.at> (raw)
The while loop in produce_free_peb() assumes that each work will produce a
free PEB. This is not true.
If ubi->works_count is 1 and the only scheduled work is the
wear_leveling_worker() produce_free_peb() can loop forever in case
nobody schedules an erase work.
Fix this issue by checking in the while loop whether work is scheduled.
Signed-off-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/ubi/wl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 0509c8a..6add739 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -272,7 +272,7 @@ static int produce_free_peb(struct ubi_device *ubi)
{
int err;
- while (!ubi->free.rb_node) {
+ while (!ubi->free.rb_node && ubi->works_count) {
spin_unlock(&ubi->wl_lock);
dbg_wl("do one work synchronously");
--
1.8.4.5
next reply other threads:[~2014-09-19 15:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-19 15:37 Richard Weinberger [this message]
2014-09-24 12:36 ` Artem Bityutskiy
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