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authorTasos Sahanidis <tasos@tasossah.com>2021-09-03 09:47:58 +0300
committerJens Axboe <axboe@kernel.dk>2021-12-03 06:32:40 -0700
commitfb48febce7e30baed94dd791e19521abd2c3fd83 (patch)
tree3512350a55415769b353cef01bdaa54dcf07c2a0
parent2bfdbe8b7ebd17b5331071071a910fbabc64b436 (diff)
floppy: Fix hang in watchdog when disk is ejected
When the watchdog detects a disk change, it calls cancel_activity(), which in turn tries to cancel the fd_timer delayed work. In the above scenario, fd_timer_fn is set to fd_watchdog(), meaning it is trying to cancel its own work. This results in a hang as cancel_delayed_work_sync() is waiting for the watchdog (itself) to return, which never happens. This can be reproduced relatively consistently by attempting to read a broken floppy, and ejecting it while IO is being attempted and retried. To resolve this, this patch calls cancel_delayed_work() instead, which cancels the work without waiting for the watchdog to return and finish. Before this regression was introduced, the code in this section used del_timer(), and not del_timer_sync() to delete the watchdog timer. Link: https://lore.kernel.org/r/399e486c-6540-db27-76aa-7a271b061f76@tasossah.com Fixes: 070ad7e793dc ("floppy: convert to delayed work and single-thread wq") Signed-off-by: Tasos Sahanidis <tasos@tasossah.com> Signed-off-by: Denis Efremov <efremov@linux.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/block/floppy.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 0c638de25023..f0e36c18f349 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -1015,7 +1015,7 @@ static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
static void cancel_activity(void)
{
do_floppy = NULL;
- cancel_delayed_work_sync(&fd_timer);
+ cancel_delayed_work(&fd_timer);
cancel_work_sync(&floppy_work);
}