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USB: usb-skeleton" use anchors in suspend/resume handling

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use anchors in suspend/resume handling

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-06-11 14:55:08 +02:00 committed by Greg Kroah-Hartman
parent e73c7247b8
commit 758f7e161b
1 changed files with 37 additions and 5 deletions
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42
drivers/usb/usb-skeleton.c
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@ -57,6 +57,7 @@ struct usb_skel {
__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
int errors; /* the last request tanked */
int open_count; /* count the number of openers */
spinlock_t err_lock; /* lock for errors */
struct kref kref;
struct mutex io_mutex; /* synchronize I/O with disconnect */
@ -101,12 +102,26 @@ static int skel_open(struct inode *inode, struct file *file)
/* increment our usage count for the device */
kref_get(&dev->kref);
/* prevent the device from being autosuspended */
retval = usb_autopm_get_interface(interface);
if (retval) {
/* lock the device to allow correctly handling errors
* in resumption */
mutex_lock(&dev->io_mutex);
if (!dev->open_count++) {
retval = usb_autopm_get_interface(interface);
if (retval) {
dev->open_count--;
mutex_unlock(&dev->io_mutex);
kref_put(&dev->kref, skel_delete);
goto exit;
}
} /* else { //uncomment this block if you want exclusive open
retval = -EBUSY;
dev->open_count--;
mutex_unlock(&dev->io_mutex);
kref_put(&dev->kref, skel_delete);
goto exit;
}
} */
/* prevent the device from being autosuspended */
/* save our object in the file's private structure */
file->private_data = dev;
@ -125,7 +140,7 @@ static int skel_release(struct inode *inode, struct file *file)
/* allow the device to be autosuspended */
mutex_lock(&dev->io_mutex);
if (dev->interface)
if (!--dev->open_count && dev->interface)
usb_autopm_put_interface(dev->interface);
mutex_unlock(&dev->io_mutex);
@ -437,10 +452,27 @@ static void skel_draw_down(struct usb_skel *dev)
usb_kill_anchored_urbs(&dev->submitted);
}
static int skel_suspend(struct usb_interface *intf, pm_message_t message)
{
struct usb_skel *dev = usb_get_intfdata(intf);
if (!dev)
return 0;
skel_draw_down(dev);
return 0;
}
static int skel_resume (struct usb_interface *intf)
{
return 0;
}
static struct usb_driver skel_driver = {
.name = "skeleton",
.probe = skel_probe,
.disconnect = skel_disconnect,
.suspend = skel_suspend,
.resume = skel_resume,
.id_table = skel_table,
.supports_autosuspend = 1,
};