linux-kernel - [ 26/46] PCI: EHCI: Fix crash during hibernation on ASUS computers

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Date:	Wed, 12 Sep 2012 16:39:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [ 26/46] PCI: EHCI: Fix crash during hibernation on ASUS computers

From: Greg KH <gregkh@...uxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Rafael J. Wysocki" <rjw@...k.pl>

commit 0b68c8e2c3afaf9807eb1ebe0ccfb3b809570aa4 upstream.

Commit dbf0e4c (PCI: EHCI: fix crash during suspend on ASUS
computers) added a workaround for an ASUS suspend issue related to
USB EHCI and a bug in a number of ASUS BIOSes that attempt to shut
down the EHCI controller during system suspend if its PCI command
register doesn't contain 0 at that time.

It turns out that the same workaround is necessary in the analogous
hibernation code path, so add it.

References: https://bugzilla.kernel.org/show_bug.cgi?id=45811
Reported-and-tested-by: Oleksij Rempel <bug-track@...her-privat.net>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/pci-driver.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -936,6 +936,13 @@ static int pci_pm_poweroff_noirq(struct
 	if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
 		pci_prepare_to_sleep(pci_dev);

+	/*
+	 * The reason for doing this here is the same as for the analogous code
+	 * in pci_pm_suspend_noirq().
+	 */
+	if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
+		pci_write_config_word(pci_dev, PCI_COMMAND, 0);
+
 	return 0;
 }

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