netdev - [PATCH][DLCI]: Fix tiny race between module unload and sock

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Message-ID: <47E3DBB1.4090706@openvz.org>
Date:	Fri, 21 Mar 2008 19:00:49 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	David Miller <davem@...emloft.net>
CC:	Mike McLagan <mike.mclagan@...ux.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH][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@...nvz.org>

---

diff --git a/net/socket.c b/net/socket.c
index b6d35cd..9d3fbfb 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);
--
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