diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 36f5bf6a0752..10b0365f3439 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -703,24 +703,28 @@ EXPORT_SYMBOL_GPL(ehci_setup); static irqreturn_t ehci_irq (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); - u32 status, masked_status, pcd_status = 0, cmd; + u32 status, current_status, masked_status, pcd_status = 0; + u32 cmd; int bh; spin_lock(&ehci->lock); - status = ehci_readl(ehci, &ehci->regs->status); + status = 0; + current_status = ehci_readl(ehci, &ehci->regs->status); +restart: /* e.g. cardbus physical eject */ - if (status == ~(u32) 0) { + if (current_status == ~(u32) 0) { ehci_dbg (ehci, "device removed\n"); goto dead; } + status |= current_status; /* * 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); + masked_status = current_status & (INTR_MASK | STS_FLR); /* Shared IRQ? */ if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) { @@ -730,6 +734,12 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* clear (just) interrupts */ ehci_writel(ehci, masked_status, &ehci->regs->status); + + /* For edge interrupts, don't race with an interrupt bit being raised */ + current_status = ehci_readl(ehci, &ehci->regs->status); + if (current_status & INTR_MASK) + goto restart; + cmd = ehci_readl(ehci, &ehci->regs->command); bh = 0; |