linux-kernel - [PATCH 01/10] nbd: sock_shutdown, remove conditional lock

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Date:	Mon, 27 Jul 2015 09:12:47 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	nbd-general@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	Markus Pargmann <mpa@...gutronix.de>
Subject: [PATCH 01/10] nbd: sock_shutdown, remove conditional lock

Move the conditional lock from sock_shutdown into the surrounding code.

Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
---
 drivers/block/nbd.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 7b9ae7a65c1e..ff59093c5dc1 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -117,18 +117,14 @@ static void nbd_end_request(struct nbd_device *nbd, struct request *req)
 /*
  * Forcibly shutdown the socket causing all listeners to error
  */
-static void sock_shutdown(struct nbd_device *nbd, int lock)
+static void sock_shutdown(struct nbd_device *nbd)
 {
-	if (lock)
-		mutex_lock(&nbd->tx_lock);
 	if (nbd->sock) {
 		dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n");
 		kernel_sock_shutdown(nbd->sock, SHUT_RDWR);
 		nbd->sock = NULL;
 		del_timer_sync(&nbd->timeout_timer);
 	}
-	if (lock)
-		mutex_unlock(&nbd->tx_lock);
 }
 
 static void nbd_xmit_timeout(unsigned long arg)
@@ -427,7 +423,9 @@ static int nbd_do_it(struct nbd_device *nbd)
 		ret = dequeue_signal_lock(current, &current->blocked, &info);
 		dev_warn(nbd_to_dev(nbd), "pid %d, %s, got signal %d\n",
 			 task_pid_nr(current), current->comm, ret);
-		sock_shutdown(nbd, 1);
+		mutex_lock(&nbd->tx_lock);
+		sock_shutdown(nbd);
+		mutex_unlock(&nbd->tx_lock);
 		ret = -ETIMEDOUT;
 	}
 
@@ -541,7 +539,9 @@ static int nbd_thread(void *data)
 						  &info);
 			dev_warn(nbd_to_dev(nbd), "pid %d, %s, got signal %d\n",
 				 task_pid_nr(current), current->comm, ret);
-			sock_shutdown(nbd, 1);
+			mutex_lock(&nbd->tx_lock);
+			sock_shutdown(nbd);
+			mutex_unlock(&nbd->tx_lock);
 			break;
 		}
 
@@ -735,7 +735,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
 		mutex_lock(&nbd->tx_lock);
 		if (error)
 			return error;
-		sock_shutdown(nbd, 0);
+		sock_shutdown(nbd);
 		sock = nbd->sock;
 		nbd->sock = NULL;
 		nbd_clear_que(nbd);
-- 
2.1.4

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