[PATCH] MSI-X: fix resume crash

So I think the right solution is to simply make pci_enable_device just
flip enable bits and move the rest of the work someplace else.

However a thorough cleanup is a little extreme for this point in the
release cycle, so I think a quick hack that makes the code not stomp the
irq when msi irq's are enabled should be the first fix.  Then we can
later make the code not change the irqs at all.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 15 insertions, 6 deletions

diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c
index a2b9c60c2777..5b79a7a772d4 100644
--- a/arch/cris/arch-v32/drivers/pci/bios.c
+++ b/arch/cris/arch-v32/drivers/pci/bios.c
@@ -100,7 +100,9 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
         if ((err = pcibios_enable_resources(dev, mask)) < 0)
                 return err;
 
-        return pcibios_enable_irq(dev);
+        if (!dev->msi_enabled)
+                pcibios_enable_irq(dev);
+        return 0;
 }
 
 int pcibios_assign_resources(void)
diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
index f7279d78995a..0b581e3cf7c7 100644
--- a/arch/frv/mb93090-mb00/pci-vdk.c
+++ b/arch/frv/mb93090-mb00/pci-vdk.c
@@ -466,6 +466,7 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 
         if ((err = pcibios_enable_resources(dev, mask)) < 0)
                 return err;
-        pcibios_enable_irq(dev);
+        if (!dev->msi_enabled)
+                pcibios_enable_irq(dev);
         return 0;
 }
diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 948436665385..3f78d4d8ecf3 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -434,11 +434,13 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
         if ((err = pcibios_enable_resources(dev, mask)) < 0)
                 return err;
 
-        return pcibios_enable_irq(dev);
+        if (!dev->msi_enabled)
+                return pcibios_enable_irq(dev);
+        return 0;
 }
 
 void pcibios_disable_device (struct pci_dev *dev)
 {
-        if (pcibios_disable_irq)
+        if (!dev->msi_enabled && pcibios_disable_irq)
                 pcibios_disable_irq(dev);
 }
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 474d179966dc..f8bcccd6d417 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -557,14 +557,18 @@ pcibios_enable_device (struct pci_dev *dev, int mask)
         if (ret < 0)
                 return ret;
 
-        return acpi_pci_irq_enable(dev);
+        if (!dev->msi_enabled)
+                return acpi_pci_irq_enable(dev);
+        return 0;
 }
 
 void
 pcibios_disable_device (struct pci_dev *dev)
 {
         BUG_ON(atomic_read(&dev->enable_cnt));
-        acpi_pci_irq_disable(dev);
+        if (!dev->msi_enabled)
+                acpi_pci_irq_disable(dev);
+        return 0;
 }
 
 void