kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

USB: kill BKL in skeleton driver

Browse source 
Iet's kill BKL where we can. This is relative to the last patch to the
skeleton driver.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-03-01 23:07:32 +01:00 committed by Greg Kroah-Hartman
parent ba35e02bdc
commit 5d9b89b33f
1 changed files with 10 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/usb/usb-skeleton.c
View file

@ -34,6 +34,9 @@ static struct usb_device_id skel_table [] = {
};
MODULE_DEVICE_TABLE(usb, skel_table);
/* to prevent a race between open and disconnect */
static DEFINE_MUTEX(skel_open_lock);
/* Get a minor range for your devices from the usb maintainer */
#define USB_SKEL_MINOR_BASE 192
@ -80,8 +83,10 @@ static int skel_open(struct inode *inode, struct file *file)
subminor = iminor(inode);
mutex_lock(&skel_open_lock);
interface = usb_find_interface(&skel_driver, subminor);
if (!interface) {
mutex_unlock(&skel_open_lock);
err ("%s - error, can't find device for minor %d",
__FUNCTION__, subminor);
retval = -ENODEV;
@ -90,12 +95,15 @@ static int skel_open(struct inode *inode, struct file *file)
dev = usb_get_intfdata(interface);
if (!dev) {
mutex_unlock(&skel_open_lock);
retval = -ENODEV;
goto exit;
}
/* increment our usage count for the device */
kref_get(&dev->kref);
/* now we can drop the lock */
mutex_unlock(&skel_open_lock);
/* prevent the device from being autosuspended */
retval = usb_autopm_get_interface(interface);
@ -361,14 +369,14 @@ static void skel_disconnect(struct usb_interface *interface)
int minor = interface->minor;
/* prevent skel_open() from racing skel_disconnect() */
lock_kernel();
mutex_lock(&skel_open_lock);
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* give back our minor */
usb_deregister_dev(interface, &skel_class);
unlock_kernel();
mutex_unlock(&skel_open_lock);
/* prevent more I/O from starting */
mutex_lock(&dev->io_mutex);