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block/rnbd-srv: Set keep_id to true after mutex_trylock 

After setting keep_id if the mutex trylock fails, the keep_id stays set
for the rest of the sess_dev lifetime.

Therefore, set keep_id to true after mutex_trylock succeeds, so that a
failure of trylock does'nt touch keep_id.

Fixes: b168e1d85c ("block/rnbd-srv: Prevent a deadlock generated by accessing sysfs in parallel")
Cc: gi-oh.kim@ionos.com
Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20220707143122.460362-2-haris.iqbal@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Md Haris Iqbal 2022-07-07 16:31:21 +02:00 committed by Jens Axboe
parent 1a70200f40
commit 4bc14f3101
1 changed files with 2 additions and 1 deletions
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3
drivers/block/rnbd/rnbd-srv.c
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@ -323,10 +323,11 @@ void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
{
struct rnbd_srv_session *sess = sess_dev->sess;
sess_dev->keep_id = true;
/* It is already started to close by client's close message. */
if (!mutex_trylock(&sess->lock))
return;
sess_dev->keep_id = true;
/* first remove sysfs itself to avoid deadlock */
sysfs_remove_file_self(&sess_dev->kobj, &attr->attr);
rnbd_srv_destroy_dev_session_sysfs(sess_dev);