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| author | Tasos Sahanidis <tasos@tasossah.com> | 2021-09-03 09:47:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 12:53:53 +0300 |
| commit | 04fdd426cef2acfec33c703c700bb1d8862c7804 (patch) | |
| tree | e15141a7f480fb86d16e996564a38ce8696adeb0 /drivers/block | |
| parent | 45bbe008013fb93b16f28d0eacbc8810c949e2b3 (diff) | |
| download | linux-04fdd426cef2acfec33c703c700bb1d8862c7804.tar.xz | |
floppy: Fix hang in watchdog when disk is ejected
[ Upstream commit fb48febce7e30baed94dd791e19521abd2c3fd83 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/floppy.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 7df79ae6b0a1..eb4f841902ae 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); } |