[PATCH 1/2] pcie/dpc: Skip DPC event if device is not present

[Keith Busch <keith.busch@intel.com>]

The DPC interupt may be executed on a device that is being removed. Skip
queuing event handling if the status is all 1's, which should be seen
only if the device is not present.

Signed-off-by: Keith Busch <keith.busch@intel.com>
---
 drivers/pci/pcie/pcie-dpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
index d4d70ef..fc2a4a7 100644
--- a/drivers/pci/pcie/pcie-dpc.c
+++ b/drivers/pci/pcie/pcie-dpc.c
@@ -87,7 +87,7 @@ static irqreturn_t dpc_irq(int irq, void *context)
 	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);
 	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_SOURCE_ID,
 			     &source);
-	if (!status)
+	if (!status || status == (u16)(~0))
 		return IRQ_NONE;
 
 	dev_info(&dpc->dev->device, "DPC containment event, status:%#06x source:%#06x\n",
-- 
2.7.2