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authorAlan Stern <stern@rowland.harvard.edu>2012-04-18 11:33:00 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-27 09:51:08 -0700
commit3599fbb407dfa09d1d8d1507961fa03088c3b695 (patch)
parentebc3dcf800ccb59ab5834e33a96f5691eec39820 (diff)
EHCI: always clear the STS_FLR status bit
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 <stern@rowland.harvard.edu> Reported-and-tested-by: Tomoya MORINAGA <tomoya.rohm@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index b27ceab17743..6a25c3514097 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -808,8 +808,13 @@ 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(hcd->state == HC_STATE_HALT)) {
return IRQ_NONE;