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usb: host: xhci: simplify irq handler return 

Instead of having several return points, let's use a local variable and
a single place to return. This makes the code slightly easier to read.

[set ret = IRQ_HANDLED in default working case  -Mathias]
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felipe Balbi 2017-01-23 14:20:07 +02:00 committed by Greg Kroah-Hartman
parent 0b7c105a04
commit 76a35293b9
1 changed files with 17 additions and 15 deletions
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32
drivers/usb/host/xhci-ring.c
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@ -2605,27 +2605,28 @@ static int xhci_handle_event(struct xhci_hcd *xhci)
irqreturn_t xhci_irq(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
u32 status;
u64 temp_64;
union xhci_trb *event_ring_deq;
irqreturn_t ret = IRQ_NONE;
dma_addr_t deq;
u64 temp_64;
u32 status;
spin_lock(&xhci->lock);
/* Check if the xHC generated the interrupt, or the irq is shared */
status = readl(&xhci->op_regs->status);
if (status == 0xffffffff)
goto hw_died;
if (!(status & STS_EINT)) {
spin_unlock(&xhci->lock);
return IRQ_NONE;
if (status == 0xffffffff) {
ret = IRQ_HANDLED;
goto out;
}
if (!(status & STS_EINT))
goto out;
if (status & STS_FATAL) {
xhci_warn(xhci, "WARNING: Host System Error\n");
xhci_halt(xhci);
hw_died:
spin_unlock(&xhci->lock);
return IRQ_HANDLED;
ret = IRQ_HANDLED;
goto out;
}
/*
@ -2656,9 +2657,8 @@ hw_died:
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
xhci_write_64(xhci, temp_64 | ERST_EHB,
&xhci->ir_set->erst_dequeue);
spin_unlock(&xhci->lock);
return IRQ_HANDLED;
ret = IRQ_HANDLED;
goto out;
}
event_ring_deq = xhci->event_ring->dequeue;
@ -2683,10 +2683,12 @@ hw_died:
/* Clear the event handler busy flag (RW1C); event ring is empty. */
temp_64 |= ERST_EHB;
xhci_write_64(xhci, temp_64, &xhci->ir_set->erst_dequeue);
ret = IRQ_HANDLED;
out:
spin_unlock(&xhci->lock);
return IRQ_HANDLED;
return ret;
}
irqreturn_t xhci_msi_irq(int irq, void *hcd)