ALSA: usb-audio: store protocol version in struct audioformat
Instead of reading bInterfaceProtocol from the descriptor whenever it's
needed, store this value in the audioformat structure. Besides
simplifying some code, this will allow us to correctly handle vendor-
specific devices where the descriptors are marked with other values.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 3a2ce39..86f80c6 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -407,9 +407,7 @@
struct usb_host_interface *alts,
struct audioformat *fmt, int rate)
{
- struct usb_interface_descriptor *altsd = get_iface_desc(alts);
-
- switch (altsd->bInterfaceProtocol) {
+ switch (fmt->protocol) {
case UAC_VERSION_1:
default:
return set_sample_rate_v1(chip, iface, alts, fmt, rate);