linux-kernel - [tip:bkl/arch] um: Remove BKL from mmapper

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Date:	Wed, 14 Oct 2009 15:45:49 GMT
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	jdike@...toit.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de
Subject: [tip:bkl/arch] um: Remove BKL from mmapper

Commit-ID:  d63c489b881707adf9c0b89f771b30a1d78f4197
Gitweb:     http://git.kernel.org/tip/d63c489b881707adf9c0b89f771b30a1d78f4197
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sat, 10 Oct 2009 15:36:34 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 14 Oct 2009 15:35:51 +0200

um: Remove BKL from mmapper

cycle_kernel_lock() was added during the big BKL pushdown. It should
ensure the serializiation against driver init code.

mmapper_open() cannot be called before misc_register() succeeded, but
p_buf might be uninitialized.

Move the initialization of p_buf before the misc_register() call and
get rid of cycle_kernel_lock().

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <20091010153349.682213670@...utronix.de>
Cc: Jeff Dike <jdike@...toit.com>
---
 arch/um/drivers/mmapper_kern.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index eb24032..d22f9e5 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -16,7 +16,7 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/mm.h>
-#include <linux/smp_lock.h>
+
 #include <asm/uaccess.h>
 #include "mem_user.h"
 
@@ -78,7 +78,6 @@ out:
 
 static int mmapper_open(struct inode *inode, struct file *file)
 {
-	cycle_kernel_lock();
 	return 0;
 }
 
@@ -115,18 +114,16 @@ static int __init mmapper_init(void)
 	v_buf = (char *) find_iomem("mmapper", &mmapper_size);
 	if (mmapper_size == 0) {
 		printk(KERN_ERR "mmapper_init - find_iomem failed\n");
-		goto out;
+		return -ENODEV;
 	}
+	p_buf = __pa(v_buf);
 
 	err = misc_register(&mmapper_dev);
 	if (err) {
 		printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
 		       err);
-		goto out;
+		return err;;
 	}
-
-	p_buf = __pa(v_buf);
-out:
 	return 0;
 }
 
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