linux-kernel - [PATCH] sony_pi: Remove the BKL from sonypi_misc

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Date:	Sun, 18 Oct 2009 23:54:53 +0200 (CEST)
From:	John Kacur <jkacur@...hat.com>
To:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
cc:	Arnd Bergmann <arndbergmann@...glemail.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH] sony_pi: Remove the BKL from sonypi_misc_open

>From b5fefbe4ab8783a0299953b0869cf2af24160875 Mon Sep 17 00:00:00 2001
From: John Kacur <jkacur@...hat.com>
Date: Sun, 18 Oct 2009 23:49:49 +0200
Subject: [PATCH] sony_pi: Remove the BKL from sonypi_misc_open

The BKL is in this function because of the BKL pushdown
(see commit f8f2c79d594463427f7114cedb1555110d547d89)

It is not needed here because the mutex_lock sonypi_device.lock
provides the necessary locking.

Signed-off-by: John Kacur <jkacur@...hat.com>
---
 drivers/char/sonypi.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/char/sonypi.c b/drivers/char/sonypi.c
index 8c262aa..f64600b 100644
--- a/drivers/char/sonypi.c
+++ b/drivers/char/sonypi.c
@@ -50,7 +50,6 @@
 #include <linux/err.h>
 #include <linux/kfifo.h>
 #include <linux/platform_device.h>
-#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -902,14 +901,13 @@ static int sonypi_misc_release(struct inode *inode, struct file *file)
 
 static int sonypi_misc_open(struct inode *inode, struct file *file)
 {
-	lock_kernel();
 	mutex_lock(&sonypi_device.lock);
 	/* Flush input queue on first open */
 	if (!sonypi_device.open_count)
 		kfifo_reset(sonypi_device.fifo);
 	sonypi_device.open_count++;
 	mutex_unlock(&sonypi_device.lock);
-	unlock_kernel();
+
 	return 0;
 }
 
-- 
1.6.0.6

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