linux-kernel - [PATCH linux-next] procfs: fix rcu-lock/unlock in proc_reg_open() and proc_reg

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Date:	Thu, 07 Mar 2013 11:21:29 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nathan Zimmer <nzimmer@....com>
Subject: [PATCH linux-next] procfs: fix rcu-lock/unlock in proc_reg_open() and
 proc_reg_release()

fix for a21813be23329e2788164eab532e79cb0e513cfc (linux-next)
"procfs: improve scaling in proc"

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: Nathan Zimmer <nzimmer@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 fs/proc/inode.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 6cccc4d..073846c 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -352,7 +352,7 @@ static int proc_reg_open(struct inode *inode, struct file *file)
 	atomic_inc(&pde->pde_users);
 	open = fops->open;
 	release = fops->release;
-	rcu_read_lock();
+	rcu_read_unlock();
 
 	if (open)
 		rv = open(inode, file);
@@ -400,6 +400,7 @@ static int proc_reg_release(struct inode *inode, struct file *file)
 	rcu_read_lock();
 	fops = rcu_dereference(pde->proc_fops);
 	if (!fops) {
+		rcu_read_unlock();
 		/*
 		 * Can't simply exit, __fput() will think that everything is OK,
 		 * and move on to freeing struct file. remove_proc_entry() will

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