From: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Date: Thu, 10 Dec 2020 10:18:22 +0000 (+0100)
Subject: block/rnbd-srv: Protect dev session sysfs removal
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=87019e7d99d707e60e20ea3245a561419d5de5ce;p=linux.git

block/rnbd-srv: Protect dev session sysfs removal

Since the removal of the session sysfs can also be called from the
function destroy_sess, there is a need to protect the call from the
function rnbd_srv_sess_dev_force_close

Fixes: 786998050cbc ("block/rnbd-srv: close a mapped device from server side.")
Signed-off-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Reviewed-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index d1ee72ed8384f..066411cce5e26 100644
--- a/drivers/block/rnbd/rnbd-srv.c
+++ b/drivers/block/rnbd/rnbd-srv.c
@@ -338,9 +338,10 @@ static int rnbd_srv_link_ev(struct rtrs_srv *rtrs,
 
 void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev)
 {
+	mutex_lock(&sess_dev->sess->lock);
 	rnbd_srv_destroy_dev_session_sysfs(sess_dev);
+	mutex_unlock(&sess_dev->sess->lock);
 	sess_dev->keep_id = true;
-
 }
 
 static int process_msg_close(struct rtrs_srv *rtrs,