---

yaml
---
r: 174892
b: refs/heads/master
c: 8e08b97
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 294a39e7829dfd663e6c5c94cede0c6a0c13e37f
+refs/heads/master: 8e08b9766b50826e12139a821b6b3bdfcadcceda

trunk/drivers/usb/core/urb.c

@@ -429,15 +429,27 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 	case USB_ENDPOINT_XFER_ISOC:
 	case USB_ENDPOINT_XFER_INT:
 		/* too small? */
-		if (urb->interval <= 0)
-			return -EINVAL;
+		switch (dev->speed) {
+		case USB_SPEED_VARIABLE:
+			if (urb->interval < 6)
+				return -EINVAL;
+			break;
+		default:
+			if (urb->interval <= 0)
+				return -EINVAL;
+			break;
+		}
 		/* too big? */
 		switch (dev->speed) {
 		case USB_SPEED_SUPER:	/* units are 125us */
 			/* Handle up to 2^(16-1) microframes */
 			if (urb->interval > (1 << 15))
 				return -EINVAL;
 			max = 1 << 15;
+		case USB_SPEED_VARIABLE:
+			if (urb->interval > 16)
+				return -EINVAL;
+			break;
 		case USB_SPEED_HIGH:	/* units are microframes */
 			/* NOTE usb handles 2^15 */
 			if (urb->interval > (1024 * 8))
@@ -461,8 +473,10 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 		default:
 			return -EINVAL;
 		}
-		/* Round down to a power of 2, no more than max */
-		urb->interval = min(max, 1 << ilog2(urb->interval));
+		if (dev->speed != USB_SPEED_VARIABLE) {
+			/* Round down to a power of 2, no more than max */
+			urb->interval = min(max, 1 << ilog2(urb->interval));
+		}
 	}
 
 	return usb_hcd_submit_urb(urb, mem_flags);