diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index f9c08d2fe33a..eb4b10229a05 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2039,25 +2039,25 @@ void xhci_handle_event(struct xhci_hcd *xhci) irqreturn_t xhci_irq(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); - u32 temp, temp2; + u32 status, irq_pending; union xhci_trb *trb; u64 temp_64; spin_lock(&xhci->lock); trb = xhci->event_ring->dequeue; /* 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) + status = xhci_readl(xhci, &xhci->op_regs->status); + irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending); + if (status == 0xffffffff && irq_pending == 0xffffffff) goto hw_died; - if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) { + if (!(status & STS_EINT) && !ER_IRQ_PENDING(irq_pending)) { spin_unlock(&xhci->lock); xhci_warn(xhci, "Spurious interrupt.\n"); return IRQ_NONE; } - xhci_dbg(xhci, "op reg status = %08x\n", temp); - xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2); + xhci_dbg(xhci, "op reg status = %08x\n", status); + xhci_dbg(xhci, "ir set irq_pending = %08x\n", irq_pending); xhci_dbg(xhci, "Event ring dequeue ptr:\n"); xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n", (unsigned long long) @@ -2067,7 +2067,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd) (unsigned int) trb->link.intr_target, (unsigned int) trb->link.control); - if (temp & STS_FATAL) { + if (status & STS_FATAL) { xhci_warn(xhci, "WARNING: Host System Error\n"); xhci_halt(xhci); hw_died: @@ -2081,15 +2081,14 @@ hw_died: * so we can receive interrupts from other MSI-X interrupters. * Write 1 to clear the interrupt status. */ - temp |= STS_EINT; - xhci_writel(xhci, temp, &xhci->op_regs->status); + status |= STS_EINT; + xhci_writel(xhci, status, &xhci->op_regs->status); /* FIXME when MSI-X is supported and there are multiple vectors */ /* Clear the MSI-X event interrupt status */ /* Acknowledge the interrupt */ - temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); - temp |= 0x3; - xhci_writel(xhci, temp, &xhci->ir_set->irq_pending); + irq_pending |= 0x3; + xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending); if (xhci->xhc_state & XHCI_STATE_DYING) xhci_dbg(xhci, "xHCI dying, ignoring interrupt. " @@ -2103,8 +2102,6 @@ hw_died: /* Clear the event handler busy flag (RW1C); event ring is empty. */ temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue); - /* Flush posted writes -- FIXME is this necessary? */ - xhci_readl(xhci, &xhci->ir_set->irq_pending); spin_unlock(&xhci->lock); return IRQ_HANDLED; |