From: Pavel Emelyanov <xemul@openvz.org>
Date: Fri, 21 Mar 2008 22:58:52 +0000 (-0700)
Subject: [DLCI]: Fix tiny race between module unload and sock_ioctl.
X-Git-Tag: firefly_0821_release~21773^2~79
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7512cbf6efc97644812f137527a54b8e92b6a90a;p=firefly-linux-kernel-4.4.55.git

[DLCI]: Fix tiny race between module unload and sock_ioctl.

This is a narrow pedantry :) but the dlci_ioctl_hook check and call
should not be parted with the mutex lock.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/socket.c b/net/socket.c
index b6d35cd72a50..9d3fbfbc8535 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -909,11 +909,10 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 			if (!dlci_ioctl_hook)
 				request_module("dlci");
 
-			if (dlci_ioctl_hook) {
-				mutex_lock(&dlci_ioctl_mutex);
+			mutex_lock(&dlci_ioctl_mutex);
+			if (dlci_ioctl_hook)
 				err = dlci_ioctl_hook(cmd, argp);
-				mutex_unlock(&dlci_ioctl_mutex);
-			}
+			mutex_unlock(&dlci_ioctl_mutex);
 			break;
 		default:
 			err = sock->ops->ioctl(sock, cmd, arg);