From 993d668183fa49b63939a4f62a558d487fd50c22 Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Fri, 28 Apr 2017 12:02:48 -0400
Subject: [PATCH] PCI/DPC: Skip DPC event if device is not present
Git-commit: 993d668183fa49b63939a4f62a558d487fd50c22
Patch-mainline: v4.13-rc1
References: FATE#325195
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>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 77d2ca99d2ec..0bf084357237 100644
--- a/drivers/pci/pcie/pcie-dpc.c
+++ b/drivers/pci/pcie/pcie-dpc.c
@@ -92,7 +92,7 @@ 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",
--
2.19.2