USB: EHCI: fix crash during suspend on ASUS computers

This patch (as1545) fixes a problem affecting several ASUS computers:
The machine crashes or corrupts memory when going into suspend if the
ehci-hcd driver is bound to any controllers.  Users have been forced
to unbind or unload ehci-hcd before putting their systems to sleep.

After extensive testing, it was determined that the machines don't
like going into suspend when any EHCI controllers are in the PCI D3
power state.  Presumably this is a firmware bug, but there's nothing
we can do about it except to avoid putting the controllers in D3
during system sleep.

The patch adds a new flag to indicate whether the problem is present,
and avoids changing the controller's power state if the flag is set.
Runtime suspend is unaffected; this matters only for system suspend.
However as a side effect, the controller will not respond to remote
wakeup requests while the system is asleep.  Hence USB wakeup is not
functional -- but of course, this is already true in the current state
of affairs.

This fixes Bugzilla #42728.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Andrey Rahmatullin <wrar@wrar.name>
Tested-by: Oleksij Rempel (fishor) <bug-track@fisher-privat.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 622b4a48e732..57ed9e400c06 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -493,6 +493,15 @@ static int hcd_pci_suspend_noirq(struct device *dev)
 
         pci_save_state(pci_dev);
 
+        /*
+         * Some systems crash if an EHCI controller is in D3 during
+         * a sleep transition.  We have to leave such controllers in D0.
+         */
+        if (hcd->broken_pci_sleep) {
+                dev_dbg(dev, "Staying in PCI D0\n");
+                return retval;
+        }
+
         /* If the root hub is dead rather than suspended, disallow remote
          * wakeup.  usb_hc_died() should ensure that both hosts are marked as
          * dying, so we only need to check the primary roothub.