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USB: usb-skeleton.c: cleanup open_count 

It is not necessary to use the 'open_count' for handling
runtime pm only, because runtinme pm has built-in counter
to handle this, so remove it to make code clean.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Ming Lei 2011-12-16 22:20:44 +08:00 committed by Greg Kroah-Hartman
parent 26c71a79ca
commit e28dbb0661
1 changed files with 4 additions and 18 deletions
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22
drivers/usb/usb-skeleton.c
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@ -62,7 +62,6 @@ 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 */
bool ongoing_read; /* a read is going on */
bool processed_urb; /* indicates we haven't processed the urb */
spinlock_t err_lock; /* lock for errors */
@ -122,22 +121,9 @@ static int skel_open(struct inode *inode, struct file *file)
goto out_err;
}
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 */
retval = usb_autopm_get_interface(interface);
if (retval)
goto out_err;
/* save our object in the file's private structure */
file->private_data = dev;
@ -161,7 +147,7 @@ static int skel_release(struct inode *inode, struct file *file)
/* allow the device to be autosuspended */
mutex_lock(&dev->io_mutex);
if (!--dev->open_count && dev->interface)
if (dev->interface)
usb_autopm_put_interface(dev->interface);
mutex_unlock(&dev->io_mutex);