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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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1
drivers/usb/host/ehci-hcd.c
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@@ -543,6 +543,7 @@ static int ehci_init(struct usb_hcd *hcd)
*/
ehci->periodic_size = DEFAULT_I_TDPS;
INIT_LIST_HEAD(&ehci->cached_itd_list);
INIT_LIST_HEAD(&ehci->cached_sitd_list);
if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
return retval;