This is a note to let you know that I've just added the patch titled
EHCI: fix criterion for resuming the root hub
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ehci-fix-criterion-for-resuming-the-root-hub.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Sun Apr 29 18:02:17 2012
From: Alan Stern <[email protected]>
Date: Wed, 25 Apr 2012 01:17:42 -0500
Subject: EHCI: fix criterion for resuming the root hub
To: Greg KH <[email protected]>
Message-ID: <20120425061741.GA14971@burratino>
From: Alan Stern <[email protected]>
commit dc75ce9d929aabeb0843a6b1a4ab320e58ba1597 upstream.
This patch (as1542) changes the criterion ehci-hcd uses to tell when
it needs to resume the controller's root hub. A resume is needed when
a port status change is detected, obviously, but only if the root hub
is currently suspended.
Right now the driver tests whether the root hub is running, and that
is not the correct test. In particular, if the controller has died
then the root hub should not be restarted. In addition, some buggy
hardware occasionally requires the root hub to be running and
sending out SOF packets even while it is nominally supposed to be
suspended.
In the end, the test needs to be changed. Rather than checking whether
the root hub is currently running, the driver will now check whether
the root hub is currently suspended. This will yield the correct
behavior in all cases.
Signed-off-by: Alan Stern <[email protected]>
CC: Peter Chen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Jonathan Nieder <[email protected]>
---
drivers/usb/host/ehci-hcd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -865,7 +865,7 @@ static irqreturn_t ehci_irq (struct usb_
pcd_status = status;
/* resume root hub? */
- if (!(cmd & CMD_RUN))
+ if (hcd->state == HC_STATE_SUSPENDED)
usb_hcd_resume_root_hub(hcd);
/* get per-port change detect bits */
Patches currently in stable-queue which might be from [email protected]
are
queue-3.0/ehci-fix-criterion-for-resuming-the-root-hub.patch
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