From: Constantine Shulyupin Date: Wed, 10 Oct 2012 14:14:00 +0000 (+0200) Subject: USB: usb-skeleton.c: fix compilation error and restored kref_put on fail in skel_open X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e8cebb9cde3716800219ea8473306d431e83154b;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git USB: usb-skeleton.c: fix compilation error and restored kref_put on fail in skel_open Fixing compilaton error. Incrementing usage counter only on successful execution of skel_open. Removing redundant locking Some last changes in function skel_open and finally commit 52a7499 Revert "USB: usb-skeleton.c: fix open/disconnect race" introduced a bug in function skel_open, which this patch fixes. Changes since v2: - refactoring - Removing redundant mutex synchronization. Changes since v1: - Fixed accordingly feedback of Oliver Neukum oneukum@suse.de: also need to drop the lock. Signed-off-by: Constantine Shulyupin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c index 0616f235bd6b..ce310170829f 100644 --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -105,20 +105,15 @@ static int skel_open(struct inode *inode, struct file *file) goto exit; } - /* increment our usage count for the device */ - kref_get(&dev->kref); - - /* lock the device to allow correctly handling errors - * in resumption */ - mutex_lock(&dev->io_mutex); - retval = usb_autopm_get_interface(interface); if (retval) - goto out_err; + goto exit; + + /* increment our usage count for the device */ + kref_get(&dev->kref); /* save our object in the file's private structure */ file->private_data = dev; - mutex_unlock(&dev->io_mutex); exit: return retval;