From: Daniel Mack Date: Wed, 24 Apr 2013 17:38:42 +0000 (+0200) Subject: ALSA: snd-usb: try harder to find USB_DT_CS_ENDPOINT X-Git-Tag: v3.2.45~64 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b475d0e41f0979b8f8f475ae5fd3e026216e318;p=pandora-kernel.git ALSA: snd-usb: try harder to find USB_DT_CS_ENDPOINT commit ebfc594c02148b6a85c2f178cf167a44a3c3ce10 upstream. The USB_DT_CS_ENDPOINT class-specific endpoint descriptor is usually stuffed directly after the standard USB endpoint descriptor, and this is where the driver currently expects it to be. There are, however, devices in the wild that have it the other way around in their descriptor sets, so the USB_DT_CS_ENDPOINT comes *before* the standard enpoint. Devices known to implement it that way are "Sennheiser BTD-500" and Plantronics USB headsets. When the driver can't find the USB_DT_CS_ENDPOINT, it won't be able to change sample rates, as the bitmask for the validity of this command is storen in bmAttributes of that descriptor. Fix this by searching the entire interface instead of just the extra bytes of the first endpoint, in case the latter fails. Signed-off-by: Daniel Mack Reported-and-tested-by: Torstein Hegge Reported-and-tested-by: Yves G Signed-off-by: Takashi Iwai Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed