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USB: EHCI: defer reclamation of siTDs

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This patch (as1369) fixes a problem in ehci-hcd.  Some controllers
occasionally run into trouble when the driver reclaims siTDs too
quickly.  This can happen while streaming audio; it causes the
controller to crash.

The patch changes siTD reclamation to work the same way as iTD
reclamation: Completed siTDs are stored on a list and not reused until
at least one frame has passed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Nate Case <ncase@xes-inc.com>
CC: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2010-04-08 16:56:37 -04:00
committed by Greg Kroah-Hartman
parent 5f677f1d45
commit 0e5f231bc1
4 changed files with 36 additions and 12 deletions
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5
drivers/usb/host/ehci.h
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@@ -87,8 +87,9 @@ struct ehci_hcd { /* one per controller */
int next_uframe; /* scan periodic, start here */
unsigned periodic_sched; /* periodic activity count */
/* list of itds completed while clock_frame was still active */
/* list of itds & sitds completed while clock_frame was still active */
struct list_head cached_itd_list;
struct list_head cached_sitd_list;
unsigned clock_frame;
/* per root hub port */
@@ -195,7 +196,7 @@ timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
clear_bit (action, &ehci->actions);
}
static void free_cached_itd_list(struct ehci_hcd *ehci);
static void free_cached_lists(struct ehci_hcd *ehci);
/*-------------------------------------------------------------------------*/