tree 9d9c10973fdf8162552f9428eec373137f44f353
parent 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f
author Takashi Iwai <tiwai@suse.de> 1507126559 +0200
committer Takashi Iwai <tiwai@suse.de> 1507727672 +0200

usb: core: Add a helper function to check the validity of EP type in URB

This patch adds a new helper function to perform a sanity check of the
given URB to see whether it contains a valid endpoint.  It's a light-
weight version of what usb_submit_urb() does, but without the kernel
warning followed by the stack trace, just returns an error code.

Especially for a driver that doesn't parse the descriptor but fills
the URB with the fixed endpoint (e.g. some quirks for non-compliant
devices), this kind of check is preferable at the probe phase before
actually submitting the urb.

Tested-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>