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USB: ehci: Minor constant fix for SCHEDULE_SLOP.

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Change the constant SCHEDULE_SLOP to be 80 microframes, instead of 10
frames.  It was always multiplied by 8 to convert frames to microframes.
SCHEDULE_SLOP is only used in ehci-sched.c.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sarah Sharp 2009-10-27 10:54:49 -07:00 committed by Greg Kroah-Hartman
parent 3c67d899cd
commit d7e055f197
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/host/ehci-sched.c
View file

@ -1385,7 +1385,7 @@ sitd_slot_ok (
* given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler! * given EHCI_TUNE_FLS and the slop). Or, write a smarter scheduler!
*/ */
#define SCHEDULE_SLOP 10 /* frames */ #define SCHEDULE_SLOP 80 /* microframes */
static int static int
iso_stream_schedule ( iso_stream_schedule (
@ -1399,7 +1399,7 @@ iso_stream_schedule (
unsigned mod = ehci->periodic_size << 3; unsigned mod = ehci->periodic_size << 3;
struct ehci_iso_sched *sched = urb->hcpriv; struct ehci_iso_sched *sched = urb->hcpriv;
if (sched->span > (mod - 8 * SCHEDULE_SLOP)) { if (sched->span > (mod - SCHEDULE_SLOP)) {
ehci_dbg (ehci, "iso request %p too long\n", urb); ehci_dbg (ehci, "iso request %p too long\n", urb);
status = -EFBIG; status = -EFBIG;
goto fail; goto fail;
@ -1432,7 +1432,7 @@ iso_stream_schedule (
start += mod; start += mod;
/* Fell behind (by up to twice the slop amount)? */ /* Fell behind (by up to twice the slop amount)? */
if (start >= max - 2 * 8 * SCHEDULE_SLOP) if (start >= max - 2 * SCHEDULE_SLOP)
start += period * DIV_ROUND_UP( start += period * DIV_ROUND_UP(
max - start, period) - mod; max - start, period) - mod;
@ -1451,7 +1451,7 @@ iso_stream_schedule (
* can also help high bandwidth if the dma and irq loads don't * can also help high bandwidth if the dma and irq loads don't
* jump until after the queue is primed. * jump until after the queue is primed.
*/ */
start = SCHEDULE_SLOP * 8 + (now & ~0x07); start = SCHEDULE_SLOP + (now & ~0x07);
start %= mod; start %= mod;
stream->next_uframe = start; stream->next_uframe = start;