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[PATCH] USB: EHCI unlink tweaks

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This patch modifies the behavior of the EHCI driver in an unlink path
that seems to be causing various issues on some systems.  Those problems
have included issues with disconnection, driver unbinding, and similar
cases where urb unlinking would just not work right.

This patch should help avoid those problems by not turning off the async
(control/bulk) schedule until it's not expecting an "async advance" IRQ,
which comes from the processing passing the schedule head.  Whether the
driver attempts to do such things is dependent on system timings, so
many folk would never have seen these problems.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2006-01-20 14:35:55 -08:00 committed by Greg Kroah-Hartman
parent d5fb7f1b5b
commit d085229938
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/host/ehci-q.c
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@ -1022,12 +1022,14 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
/* stop async schedule right now? */
if (unlikely (qh == ehci->async)) {
/* can't get here without STS_ASS set */
if (ehci_to_hcd(ehci)->state != HC_STATE_HALT) {
if (ehci_to_hcd(ehci)->state != HC_STATE_HALT
&& !ehci->reclaim) {
/* ... and CMD_IAAD clear */
writel (cmd & ~CMD_ASE, &ehci->regs->command);
wmb ();
// handshake later, if we need to
timer_action_done (ehci, TIMER_ASYNC_OFF);
}
timer_action_done (ehci, TIMER_ASYNC_OFF);
return;
}