[patch 28/29] USB: fix in usb_calc_bus_time

Greg KH
2005-07-30T00:53:23Z

[-- Attachment #1: usb-fix-usb_calc_bus_time.patch --]
[-- Type: text/plain, Size: 2928 bytes --]

From: Dan Streetman <ddstreet@ieee.org>

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>

---
drivers/usb/core/hcd.c | 4 ++--
drivers/usb/core/hcd.h | 8 +++++---
drivers/usb/host/ehci-q.c | 4 ++--
3 files changed, 9 insertions(+), 7 deletions(-)

--- gregkh-2.6.orig/drivers/usb/core/hcd.c 2005-07-29 11:30:03.000000000 -0700
+++ gregkh-2.6/drivers/usb/core/hcd.c 2005-07-29 11:36:34.000000000 -0700
@@ -939,9 +939,9 @@
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);
--- gregkh-2.6.orig/drivers/usb/core/hcd.h 2005-07-29 11:29:47.000000000 -0700
+++ gregkh-2.6/drivers/usb/core/hcd.h 2005-07-29 11:36:34.000000000 -0700
@@ -334,17 +334,19 @@
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);
--- gregkh-2.6.orig/drivers/usb/host/ehci-q.c 2005-07-29 11:29:47.000000000 -0700
+++ gregkh-2.6/drivers/usb/host/ehci-q.c 2005-07-29 11:36:34.000000000 -0700
@@ -657,8 +657,8 @@
* 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) {

--