linux-kernel - [tip:bkl/drivers] nvram: Drop the BKL from nvram

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Message-ID: <tip-83cb16727085b18191f45eb0ede6bf1f97d67a7a@git.kernel.org>
Date:	Wed, 14 Oct 2009 15:58:09 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	wim@...ana.be, viro@...iv.linux.org.uk, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:bkl/drivers] nvram: Drop the BKL from nvram_open()

Commit-ID:  83cb16727085b18191f45eb0ede6bf1f97d67a7a
Gitweb:     http://git.kernel.org/tip/83cb16727085b18191f45eb0ede6bf1f97d67a7a
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Wed, 14 Oct 2009 17:48:38 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 14 Oct 2009 17:54:03 +0200

nvram: Drop the BKL from nvram_open()

It's safe to remove the BKL from nvram_open(): there's no open()
versus read() races: nvram_init() is very simple and race-free,
it registers the device then puts it into /proc - there's no
state init to race with.

Cc: Wim Van Sebroeck <wim@...ana.be>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <1255116426-7270-1-git-send-email-fweisbec@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 drivers/char/nvram.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 2100a8f..7cf4518 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -329,14 +329,12 @@ static int nvram_ioctl(struct inode *inode, struct file *file,
 
 static int nvram_open(struct inode *inode, struct file *file)
 {
-	lock_kernel();
 	spin_lock(&nvram_state_lock);
 
 	if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
 	    (nvram_open_mode & NVRAM_EXCL) ||
 	    ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
 		spin_unlock(&nvram_state_lock);
-		unlock_kernel();
 		return -EBUSY;
 	}
 
@@ -347,7 +345,6 @@ static int nvram_open(struct inode *inode, struct file *file)
 	nvram_open_cnt++;
 
 	spin_unlock(&nvram_state_lock);
-	unlock_kernel();
 
 	return 0;
 }
--
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