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Commit 7ff52efd authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

dabusb: remove the BKL 



The dabusb device driver is sufficiently serialized using
its own mutex, no need for the big kernel lock here
in addition.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
parent a6f8dbc6

drivers/media/video/dabusb.c

+3 −15
Original line number Diff line number Diff line
@@ -32,7 +32,6 @@ 
#include <linux/list.h>

#include <linux/vmalloc.h>

#include <linux/slab.h>

#include <linux/smp_lock.h>

#include <linux/init.h>

#include <asm/uaccess.h>

#include <asm/atomic.h>
@@ -621,7 +620,6 @@ static int dabusb_open (struct inode *inode, struct file *file) 
	if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))

		return -EIO;



	lock_kernel();

	s = &dabusb[devnum - DABUSB_MINOR];



	dbg("dabusb_open");
@@ -630,21 +628,17 @@ static int dabusb_open (struct inode *inode, struct file *file) 
	while (!s->usbdev || s->opened) {

		mutex_unlock(&s->mutex);



		if (file->f_flags & O_NONBLOCK) {

		if (file->f_flags & O_NONBLOCK)

			return -EBUSY;

		}

		msleep_interruptible(500);



		if (signal_pending (current)) {

			unlock_kernel();

		if (signal_pending (current))

			return -EAGAIN;

		}

		mutex_lock(&s->mutex);

	}

	if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {

		mutex_unlock(&s->mutex);

		dev_err(&s->usbdev->dev, "set_interface failed\n");

		unlock_kernel();

		return -EINVAL;

	}

	s->opened = 1;
@@ -654,7 +648,6 @@ static int dabusb_open (struct inode *inode, struct file *file) 
	file->private_data = s;



	r = nonseekable_open(inode, file);

	unlock_kernel();

	return r;

}
@@ -689,17 +682,13 @@ static long dabusb_ioctl (struct file *file, unsigned int cmd, unsigned long arg 


	dbg("dabusb_ioctl");



	lock_kernel();

	if (s->remove_pending) {

		unlock_kernel();

	if (s->remove_pending)

		return -EIO;

	}



	mutex_lock(&s->mutex);



	if (!s->usbdev) {

		mutex_unlock(&s->mutex);

		unlock_kernel();

		return -EIO;

	}
@@ -735,7 +724,6 @@ static long dabusb_ioctl (struct file *file, unsigned int cmd, unsigned long arg 
		break;

	}

	mutex_unlock(&s->mutex);

	unlock_kernel();

	return ret;

}