USB: xhci: Check if the host controller died in IRQ handler.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
index 8c3a074a95cd..008326d5bc52 100644
--- a/drivers/usb/host/xhci-hcd.c
+++ b/drivers/usb/host/xhci-hcd.c
@@ -277,6 +277,9 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
         /* Check if the xHC generated the interrupt, or the irq is shared */
         temp = xhci_readl(xhci, &xhci->op_regs->status);
         temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        if (temp == 0xffffffff && temp2 == 0xffffffff)
+                goto hw_died;
+
         if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
                 spin_unlock(&xhci->lock);
                 return IRQ_NONE;
@@ -294,6 +297,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
         if (temp & STS_FATAL) {
                 xhci_warn(xhci, "WARNING: Host System Error\n");
                 xhci_halt(xhci);
+hw_died:
                 xhci_to_hcd(xhci)->state = HC_STATE_HALT;
                 spin_unlock(&xhci->lock);
                 return -ESHUTDOWN;