[PATCH] USB: fix in usb_calc_bus_time

This patch does the same swap, i.e. use the ISO macro if (isoc).
Additionally, it fixes the return value - the usb_calc_bus_time function
returns the time in nanoseconds (I didn't notice that before) while the
HS_USECS and HS_USECS_ISO are microseconds.  This fixes the function to
return nanoseconds always, and adjusts ehci-q.c (the only high-speed
caller of the function) to wrap the call in NS_TO_US().
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/usb/core/hcd.c

@@ -939,9 +939,9 @@ long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
 	case USB_SPEED_HIGH:	/* ISOC or INTR */
 		// FIXME adjust for input vs output
 		if (isoc)
-			tmp = HS_USECS (bytecount);
+			tmp = HS_NSECS_ISO (bytecount);
 		else
-			tmp = HS_USECS_ISO (bytecount);
+			tmp = HS_NSECS (bytecount);
 		return tmp;
 	default:
 		pr_debug ("%s: bogus device speed!\n", usbcore_name);

drivers/usb/core/hcd.h

@@ -334,17 +334,19 @@ extern void usb_release_bandwidth (struct usb_device *dev, struct urb *urb,
 extern int usb_check_bandwidth (struct usb_device *dev, struct urb *urb);
 
 /*
- * Ceiling microseconds (typical) for that many bytes at high speed
+ * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
  * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
  * to preallocate bandwidth)
  */
 #define USB2_HOST_DELAY	5	/* nsec, guess */
-#define HS_USECS(bytes) NS_TO_US ( ((55 * 8 * 2083)/1000) \
+#define HS_NSECS(bytes) ( ((55 * 8 * 2083)/1000) \
 	+ ((2083UL * (3167 + BitTime (bytes)))/1000) \
 	+ USB2_HOST_DELAY)
-#define HS_USECS_ISO(bytes) NS_TO_US ( ((38 * 8 * 2083)/1000) \
+#define HS_NSECS_ISO(bytes) ( ((38 * 8 * 2083)/1000) \
 	+ ((2083UL * (3167 + BitTime (bytes)))/1000) \
 	+ USB2_HOST_DELAY)
+#define HS_USECS(bytes) NS_TO_US (HS_NSECS(bytes))
+#define HS_USECS_ISO(bytes) NS_TO_US (HS_NSECS_ISO(bytes))
 
 extern long usb_calc_bus_time (int speed, int is_input,
 			int isoc, int bytecount);

drivers/usb/host/ehci-q.c

@@ -657,8 +657,8 @@ qh_make (
 	 * For control/bulk requests, the HC or TT handles these.
 	 */
 	if (type == PIPE_INTERRUPT) {
-		qh->usecs = usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0,
-				hb_mult (maxp) * max_packet (maxp));
+		qh->usecs = NS_TO_US (usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0,
+				hb_mult (maxp) * max_packet (maxp)));
 		qh->start = NO_FRAME;
 
 		if (urb->dev->speed == USB_SPEED_HIGH) {