PCI: Fix disable IRQ 0 in pci_reset_function()

Before initialization, dev->irq may be zero. Make sure we don't disable
it at reset time in that case.

Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 21f2ac639cab..28af496b441e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1832,7 +1832,7 @@ int pci_reset_function(struct pci_dev *dev)
         if (!(cap & PCI_EXP_DEVCAP_FLR))
                 return -ENOTTY;
 
-        if (!dev->msi_enabled && !dev->msix_enabled)
+        if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0)
                 disable_irq(dev->irq);
         pci_save_state(dev);
 
@@ -1841,7 +1841,7 @@ int pci_reset_function(struct pci_dev *dev)
         r = pci_execute_reset_function(dev);
 
         pci_restore_state(dev);
-        if (!dev->msi_enabled && !dev->msix_enabled)
+        if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0)
                 enable_irq(dev->irq);
 
         return r;