This is a note to let you know that I've just added the patch titled
EHCI: always clear the STS_FLR status bit
to the 3.3-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-always-clear-the-sts_flr-status-bit.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2fbe2bf1fd37f9d99950bd8d8093623cf22cf08b Mon Sep 17 00:00:00 2001
From: Alan Stern <[email protected]>
Date: Wed, 18 Apr 2012 11:33:00 -0400
Subject: EHCI: always clear the STS_FLR status bit
From: Alan Stern <[email protected]>
commit 2fbe2bf1fd37f9d99950bd8d8093623cf22cf08b upstream.
This patch (as1544) fixes a problem affecting some EHCI controllers.
They can generate interrupts whenever the STS_FLR status bit is turned
on, even though that bit is masked out in the Interrupt Enable
register.
Since the driver doesn't use STS_FLR anyway, the patch changes the
interrupt routine to clear that bit whenever it is set, rather than
leaving it alone.
Signed-off-by: Alan Stern <[email protected]>
Reported-and-tested-by: Tomoya MORINAGA <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/host/ehci-hcd.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -857,8 +857,13 @@ static irqreturn_t ehci_irq (struct usb_
goto dead;
}
+ /*
+ * We don't use STS_FLR, but some controllers don't like it to
+ * remain on, so mask it out along with the other status bits.
+ */
+ masked_status = status & (INTR_MASK | STS_FLR);
+
/* Shared IRQ? */
- masked_status = status & INTR_MASK;
if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) {
spin_unlock(&ehci->lock);
return IRQ_NONE;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.3/ehci-fix-criterion-for-resuming-the-root-hub.patch
queue-3.3/ehci-always-clear-the-sts_flr-status-bit.patch
queue-3.3/usb-fix-deadlock-in-bconfigurationvalue-attribute-method.patch
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