linux-kernel - [PATCH 09/51] [GFS2] use an temp variable to reduce a spin

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Message-Id: <11914878063121-git-send-email-swhiteho@redhat.com>
Date:	Thu,  4 Oct 2007 09:49:02 +0100
From:	swhiteho@...hat.com
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Denis Cheng <crquan@...il.com>,
	David Teigland <teigland@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 09/51] [GFS2] use an temp variable to reduce a spin_unlock

From: Denis Cheng <crquan@...il.com>

this is more clear.

Signed-off-by: Denis Cheng <crquan@...il.com>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
index fba1f1d..1f7b038 100644
--- a/fs/gfs2/locking/dlm/plock.c
+++ b/fs/gfs2/locking/dlm/plock.c
@@ -346,15 +346,16 @@ static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
 
 static unsigned int dev_poll(struct file *file, poll_table *wait)
 {
+	unsigned int mask = 0;
+
 	poll_wait(file, &send_wq, wait);
 
 	spin_lock(&ops_lock);
-	if (!list_empty(&send_list)) {
-		spin_unlock(&ops_lock);
-		return POLLIN | POLLRDNORM;
-	}
+	if (!list_empty(&send_list))
+		mask = POLLIN | POLLRDNORM;
 	spin_unlock(&ops_lock);
-	return 0;
+
+	return mask;
 }
 
 static const struct file_operations dev_fops = {
-- 
1.5.1.2

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