blktrace: remove the big kernel lock

According to Jens, this code does not need the BKL at all,
it is sufficiently serialized by bd_mutex.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jens Axboe <jaxboe@fusionio.com>
Cc: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/blktrace.c

@@ -23,7 +23,6 @@
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/debugfs.h>
-#include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/uaccess.h>
 
@@ -639,7 +638,6 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 	if (!q)
 		return -ENXIO;
 
-	lock_kernel();
 	mutex_lock(&bdev->bd_mutex);
 
 	switch (cmd) {
@@ -667,7 +665,6 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 	}
 
 	mutex_unlock(&bdev->bd_mutex);
-	unlock_kernel();
 	return ret;
 }
 
@@ -1652,10 +1649,9 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
 	struct block_device *bdev;
 	ssize_t ret = -ENXIO;
 
-	lock_kernel();
 	bdev = bdget(part_devt(p));
 	if (bdev == NULL)
-		goto out_unlock_kernel;
+		goto out;
 
 	q = blk_trace_get_queue(bdev);
 	if (q == NULL)
@@ -1683,8 +1679,7 @@ out_unlock_bdev:
 	mutex_unlock(&bdev->bd_mutex);
 out_bdput:
 	bdput(bdev);
-out_unlock_kernel:
-	unlock_kernel();
+out:
 	return ret;
 }
 
@@ -1714,11 +1709,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 
 	ret = -ENXIO;
 
-	lock_kernel();
 	p = dev_to_part(dev);
 	bdev = bdget(part_devt(p));
 	if (bdev == NULL)
-		goto out_unlock_kernel;
+		goto out;
 
 	q = blk_trace_get_queue(bdev);
 	if (q == NULL)
@@ -1753,8 +1747,6 @@ out_unlock_bdev:
 	mutex_unlock(&bdev->bd_mutex);
 out_bdput:
 	bdput(bdev);
-out_unlock_kernel:
-	unlock_kernel();
 out:
 	return ret ? ret : count;
 }