linux-kernel - [PATCH 2.6.25-rc8] usb: another ehci_iaa

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Date:	Wed, 2 Apr 2008 13:40:20 -0700
From:	David Brownell <david-b@...bell.net>
To:	Greg KH <greg@...ah.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Mark Lord <lkml@....ca>
Subject: [PATCH 2.6.25-rc8] usb: another ehci_iaa_watchdog fix

This patch, suggested by Alan Stern, fixes the hung USB issues
on my notebook from suspend/resume cycles.

It does so by eliminating some confusion about the internal state
machine associated with unlinking from the EHCI async schedule ring,
which caused a recent regression:

  http://bugzilla.kernel.org/show_bug.cgi?id=10345

Signed-off-by: Mark Lord <mlord@...ox.com>
Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
Merge before 2.6.25-final please...

--- rc8/drivers/usb/host/ehci-hub.c	2008-03-11 11:18:40.000000000 -0400
+++ linux/drivers/usb/host/ehci-hub.c	2008-04-02 13:28:50.000000000 -0400
@@ -135,8 +135,6 @@
 		hcd->state = HC_STATE_QUIESCING;
 	}
 	ehci->command = ehci_readl(ehci, &ehci->regs->command);
-	if (ehci->reclaim)
-		end_unlink_async(ehci);
 	ehci_work(ehci);
 
 	/* Unlike other USB host controller types, EHCI doesn't have
@@ -180,6 +178,9 @@
 	ehci_halt (ehci);
 	hcd->state = HC_STATE_SUSPENDED;
 
+	if (ehci->reclaim)
+		end_unlink_async(ehci);
+
 	/* allow remote wakeup */
 	mask = INTR_MASK;
 	if (!device_may_wakeup(&hcd->self.root_hub->dev))

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