[PATCH 105/142] USB: usb-skeleton leaking locks on open
Greg Kroah-Hartman <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
From: Mark Gross <[email protected]> This weekend I was hacking around with a trivial USB driver for talking to the boot load firmware of a USB Bit Whacker. It's running the MicroChip Pic18 boot loader firmware and I'm putting together a flash program for writing new FW to the thing. Anyway in my use of the usb-skeleton.c as my starting point I discovered my test program was getting hung up after attempting to write a buffer. The application and driver where hung in a way that required me to reboot to get it to clean up so I could try again. It turned out the code path through skel_open can grap the driver's io_mutex lock and forget to release it. The following patch fixes the problem for me. Signed-off-by: Mark Gross <[email protected]> Cc: Oliver Neukum <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/usb/usb-skeleton.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c index 8de11de..c815a40 100644 --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -125,6 +125,7 @@ static int skel_open(struct inode *inode, struct file *file) /* save our object in the file's private structure */ file->private_data = dev; + mutex_unlock(&dev->io_mutex); exit: return retval; -- 1.5.3.4 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel