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authorMing Lei <tom.leiming@gmail.com>2011-12-16 22:20:44 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-04 15:52:41 -0800
commite28dbb0661ca49ada2d6a307a1ec93dd75d515e0 (patch)
tree269aac42395eace3a010f77cd5fc29a328899d88 /drivers/usb/usb-skeleton.c
parent26c71a79cade5ccad80e0752cd82f3518df48fb3 (diff)
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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>
Diffstat (limited to 'drivers/usb/usb-skeleton.c')
-rw-r--r--drivers/usb/usb-skeleton.c22
1 files changed, 4 insertions, 18 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 3635f9e37559..d9a95847ec1f 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -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);