[PATCH 5/6] usb: dwc3: gadget: properly check ep cmd

[A. Sverdlin]

From: Felipe Balbi <felipe.balbi at linux.intel.com>

Upstream Linux commit 5999914f227b.

The cmd argument we pass to
dwc3_send_gadget_ep_cmd() could contain extra
arguments embedded. When checking for StartTransfer
command, we need to make sure to match only lower 4
bits which contain the actual command and ignore the
rest.

Reported-by: Janusz Dziedzic <januszx.dziedzic at intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi at linux.intel.com>
[A. Sverdlin: cherry-picked only DWC3_DEPCMD_CMD() define]
Signed-off-by: Alexander Sverdlin <alexander.sverdlin at siemens.com>
---
 drivers/usb/dwc3/core.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 1e7eda89a34c9..7709ab793f36d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -405,6 +405,8 @@
 #define DWC3_DEPCMD_SETTRANSFRESOURCE	(0x02 << 0)
 #define DWC3_DEPCMD_SETEPCONFIG		(0x01 << 0)
 
+#define DWC3_DEPCMD_CMD(x)		((x) & 0xf)
+
 /* The EP number goes 0..31 so ep0 is always out and ep1 is always in */
 #define DWC3_DALEPENA_EP(n)		(1 << n)
 
-- 
2.44.0