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SuSE 11.3 - man page for usb_lock_device_for_reset (suse section 9)

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USB_LOCK_DEVICE_FOR_(9) 		  USB Core APIs 		  USB_LOCK_DEVICE_FOR_(9)

NAME
       usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure

SYNOPSIS
       int usb_lock_device_for_reset(struct usb_device * udev,
				     const struct usb_interface * iface);

ARGUMENTS
       udev
	   device that's being locked

       iface
	   interface bound to the driver making the request (optional)

DESCRIPTION
       Attempts to acquire the device lock, but fails if the device is NOTATTACHED or SUSPENDED,
       or if iface is specified and the interface is neither BINDING nor BOUND. Rather than
       sleeping to wait for the lock, the routine polls repeatedly. This is to prevent deadlock
       with disconnect; in some drivers (such as usb-storage) the disconnect or suspend method
       will block waiting for a device reset to complete.

       Returns a negative error code for failure, otherwise 0.

COPYRIGHT
Kernel Hackers Manual 2.6.		    July 2010			  USB_LOCK_DEVICE_FOR_(9)
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