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

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Date:	Wed, 14 Oct 2009 15:48:53 GMT
From:	tip-bot for Frederic Weisbecker <fweisbec@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, gregkh@...e.de, tglx@...utronix.de
Subject: [tip:bkl/drivers] nvram: Drop the bkl from nvram_llseek()

Commit-ID:  6783b9cd7104470a3afab51c205c5aea53a2858f
Gitweb:     http://git.kernel.org/tip/6783b9cd7104470a3afab51c205c5aea53a2858f
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Fri, 9 Oct 2009 21:20:30 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 14 Oct 2009 17:36:49 +0200

nvram: Drop the bkl from nvram_llseek()

There is nothing to protect inside nvram_llseek(), the file
offset doesn't need to be protected and nvram_len is only
initialized from an __init path.

It's safe to remove the big kernel lock there.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <1255116030-6929-1-git-send-email-fweisbec@...il.com>
Cc: Greg KH <gregkh@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/char/generic_nvram.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c
index ef31738..fda4181 100644
--- a/drivers/char/generic_nvram.c
+++ b/drivers/char/generic_nvram.c
@@ -19,7 +19,6 @@
 #include <linux/miscdevice.h>
 #include <linux/fcntl.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <asm/nvram.h>
 #ifdef CONFIG_PPC_PMAC
@@ -32,7 +31,6 @@ static ssize_t nvram_len;
 
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
-	lock_kernel();
 	switch (origin) {
 	case 1:
 		offset += file->f_pos;
@@ -41,12 +39,11 @@ static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 		offset += nvram_len;
 		break;
 	}
-	if (offset < 0) {
-		unlock_kernel();
+	if (offset < 0)
 		return -EINVAL;
-	}
+
 	file->f_pos = offset;
-	unlock_kernel();
+
 	return file->f_pos;
 }
 
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