redonkable/alistair23-linux
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USB: Reduce scope of BKL in usb ioctl handling

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This pushes BKL down in ioctl handling and drops it
for some important ioctls

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2010-01-13 15:33:43 +01:00 committed by Greg Kroah-Hartman
parent 86266452f8
commit 01412a219c
1 changed files with 10 additions and 4 deletions
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14
drivers/usb/core/devio.c
View file

@ -1719,9 +1719,12 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
lock_kernel();
usb_lock_device(dev);
if (!connected(ps)) {
usb_unlock_device(dev);
unlock_kernel();
return -ENODEV;
}
@ -1780,10 +1783,12 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
break;
case USBDEVFS_SUBMITURB:
unlock_kernel();
snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
ret = proc_submiturb(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
lock_kernel();
break;
#ifdef CONFIG_COMPAT
@ -1835,13 +1840,17 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
break;
case USBDEVFS_REAPURB:
unlock_kernel();
snoop(&dev->dev, "%s: REAPURB\n", __func__);
ret = proc_reapurb(ps, p);
lock_kernel();
break;
case USBDEVFS_REAPURBNDELAY:
unlock_kernel();
snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
ret = proc_reapurbnonblock(ps, p);
lock_kernel();
break;
case USBDEVFS_DISCSIGNAL:
@ -1875,6 +1884,7 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
break;
}
usb_unlock_device(dev);
unlock_kernel();
if (ret >= 0)
inode->i_atime = CURRENT_TIME;
return ret;
@ -1885,9 +1895,7 @@ static long usbdev_ioctl(struct file *file, unsigned int cmd,
{
int ret;
lock_kernel();
ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
unlock_kernel();
return ret;
}
@ -1898,9 +1906,7 @@ static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
{
int ret;
lock_kernel();
ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
unlock_kernel();
return ret;
}