linux-kernel - [PATCH net-next] can: silence remove_proc

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Date:   Tue, 14 Jul 2020 14:44:50 +0800
From:   Zhang Changzhong <zhangchangzhong@...wei.com>
To:     <socketcan@...tkopp.net>, <mkl@...gutronix.de>,
        <davem@...emloft.net>, <kuba@...nel.org>
CC:     <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next] can: silence remove_proc_entry warning

If can_init_proc() fail to create /proc/net/can directory,
can_remove_proc() will trigger a warning:

WARNING: CPU: 6 PID: 7133 at fs/proc/generic.c:672 remove_proc_entry+0x17b0
Kernel panic - not syncing: panic_on_warn set ...

Fix to return early from can_remove_proc() if can proc_dir
does not exists.

Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
---
 net/can/proc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/can/proc.c b/net/can/proc.c
index e6881bf..077af42 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -471,6 +471,9 @@ void can_init_proc(struct net *net)
  */
 void can_remove_proc(struct net *net)
 {
+	if (!net->can.proc_dir)
+		return;
+
 	if (net->can.pde_version)
 		remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
 
@@ -498,6 +501,5 @@ void can_remove_proc(struct net *net)
 	if (net->can.pde_rcvlist_sff)
 		remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
 
-	if (net->can.proc_dir)
-		remove_proc_entry("can", net->proc_net);
+	remove_proc_entry("can", net->proc_net);
 }
-- 
1.8.3.1