@@ -79,6 +79,27 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
if (likely(ret == size))
return 0;
+ /*
+ * Some devices return shorter USB control packets than expected if the
+ * returned value can fit in less bytes. Zero all the bytes that the
+ * device has not written.
+ *
+ * This quirk is applied to all controls, regardless of their data type.
+ * Most controls are little-endian integers, in which case the missing
+ * bytes become 0 MSBs. For other data types, a different heuristic
+ * could be implemented if a device is found needing it.
+ *
+ * We exclude UVC_GET_INFO from the quirk. UVC_GET_LEN does not need
+ * to be excluded because its size is always 1.
+ */
+ if (ret > 0 && query != UVC_GET_INFO) {
+ memset(data + ret, 0, size - ret);
+ dev_warn_once(&dev->udev->dev,
+ "UVC non compliance: %s control %u on unit %u returned %d bytes when we expected %u.\n",
+ uvc_query_name(query), cs, unit, ret, size);
+ return 0;
+ }
+
if (ret != -EPIPE) {
dev_err(&dev->udev->dev,
"Failed to query (%s) UVC control %u on unit %u: %d (exp. %u).\n",