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authorGreg Kroah-Hartman <gregkh@suse.de>2012-01-25 00:02:38 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-25 00:02:38 +0400
commit52a749992ca6a0fd304609af40ed3bfd6cef4660 (patch)
tree713e871865a8f2cee8d6a3aebca2f4513d797f3b /drivers/usb/usb-skeleton.c
parentd1620ca9e7bb0030068c3b45b653defde8839dac (diff)
downloadlinux-52a749992ca6a0fd304609af40ed3bfd6cef4660.tar.xz
Revert "USB: usb-skeleton.c: fix open/disconnect race"
This reverts commit 26c71a79cade5ccad80e0752cd82f3518df48fb3. It's not needed, to quote Ming Lei: Looks you have queued the patch into your tree, but just now I find the patch is not needed at all, since we have had minor_rwsem(drivers/usb/core/file.c) for this purpose, please drop the patch, sorry for it. Cc: 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.c18
1 files changed, 1 insertions, 17 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 8efeae24764f..b4a71679c933 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -27,8 +27,6 @@
#define USB_SKEL_VENDOR_ID 0xfff0
#define USB_SKEL_PRODUCT_ID 0xfff0
-static DEFINE_MUTEX(skel_mutex);
-
/* table of devices that work with this driver */
static const struct usb_device_id skel_table[] = {
{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
@@ -101,25 +99,18 @@ static int skel_open(struct inode *inode, struct file *file)
goto exit;
}
- mutex_lock(&skel_mutex);
dev = usb_get_intfdata(interface);
if (!dev) {
- mutex_unlock(&skel_mutex);
retval = -ENODEV;
goto exit;
}
/* increment our usage count for the device */
kref_get(&dev->kref);
- mutex_unlock(&skel_mutex);
/* lock the device to allow correctly handling errors
* in resumption */
mutex_lock(&dev->io_mutex);
- if (!dev->interface) {
- retval = -ENODEV;
- goto out_err;
- }
retval = usb_autopm_get_interface(interface);
if (retval)
@@ -127,11 +118,7 @@ static int skel_open(struct inode *inode, struct file *file)
/* save our object in the file's private structure */
file->private_data = dev;
-
-out_err:
mutex_unlock(&dev->io_mutex);
- if (retval)
- kref_put(&dev->kref, skel_delete);
exit:
return retval;
@@ -611,6 +598,7 @@ static void skel_disconnect(struct usb_interface *interface)
int minor = interface->minor;
dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
/* give back our minor */
usb_deregister_dev(interface, &skel_class);
@@ -622,12 +610,8 @@ static void skel_disconnect(struct usb_interface *interface)
usb_kill_anchored_urbs(&dev->submitted);
- mutex_lock(&skel_mutex);
- usb_set_intfdata(interface, NULL);
-
/* decrement our usage count */
kref_put(&dev->kref, skel_delete);
- mutex_unlock(&skel_mutex);
dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor);
}