commit 07b942f689a78925698e1e6aa8ab52f55b5a5f25
author Bartosz Sokolski <bartosz.sokolski@nordicsemi.no> Tue Aug 06 14:19:42 2019 +0200
committer Carles Cufí <carles.cufi@nordicsemi.no> Sun Sep 08 12:38:52 2019 +0200
tree ff15af11706cb706d8e99ebf8b7a8bee4b702435
parent a219710760c22e971f7c0c84dae9940fd30ae337

usb: device: limit interface bits in setup message to 8

In setup messages addressing classes, USB standard defines that wIndex
constains interface number encoded in bits 0..7. Bits 8..15
are reserved and normally set to 0. However, in Audio Class they contain
entity number. Hence the need to filter 8 bits for getting interface
number.

Signed-off-by: Bartosz Sokolski <bartosz.sokolski@nordicsemi.no>

subsys/usb/usb_device.c

diff --git a/subsys/usb/usb_device.c b/subsys/usb/usb_device.c
index 602947e..2688d53 100644
--- a/subsys/usb/usb_device.c
+++ b/subsys/usb/usb_device.c
@@ -1412,7 +1412,7 @@
 
 		if ((iface->class_handler) &&
 		    (if_descr->bInterfaceNumber ==
-		     sys_le16_to_cpu(pSetup->wIndex))) {
+		     (sys_le16_to_cpu(pSetup->wIndex) & 0xFF))) {
 			return iface->class_handler(pSetup, len, data);
 		}
 	}