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authorAlan Stern <stern@rowland.harvard.edu>2012-04-18 19:33:00 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-19 00:06:59 +0400
commit2fbe2bf1fd37f9d99950bd8d8093623cf22cf08b (patch)
tree838bf037f182521ec1c3ab4871689c6711c1f8a6 /drivers/usb
parentdc75ce9d929aabeb0843a6b1a4ab320e58ba1597 (diff)
downloadlinux-2fbe2bf1fd37f9d99950bd8d8093623cf22cf08b.tar.xz
EHCI: always clear the STS_FLR status bit
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 <stern@rowland.harvard.edu> Reported-and-tested-by: Tomoya MORINAGA <tomoya.rohm@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/ehci-hcd.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 95ca07a8e1b5..4a3bc5b7a06f 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -858,8 +858,13 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
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;