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authorAlan Stern <stern@rowland.harvard.edu>2012-04-24 14:07:22 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-24 13:55:43 -0700
commit151b61284776be2d6f02d48c23c3625678960b97 (patch)
treedb1924a65d3f4416122ab4bb0600f750a6f9dd00 /include
parent6f6543f53f9ce136e01d7114bf6f0818ca54fb41 (diff)
downloadlinaro-lsk-151b61284776be2d6f02d48c23c3625678960b97.tar.gz
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/usb/hcd.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 5de415707c2..d28cc78a38e 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -126,6 +126,8 @@ struct usb_hcd {
unsigned wireless:1; /* Wireless USB HCD */
unsigned authorized_default:1;
unsigned has_tt:1; /* Integrated TT in root hub */
+ unsigned broken_pci_sleep:1; /* Don't put the
+ controller in PCI-D3 for system sleep */
unsigned int irq; /* irq allocated */
void __iomem *regs; /* device memory/io */