PCI: fix for quirk_e100_interrupt()

Check that the e100 is in the D0 power state. If it's not, it won't
respond to MMIO accesses and we end up with master-abort machine
checks on some platforms.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 63357f07ca43..637903a2df3a 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1415,9 +1415,10 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETMOS, PCI_ANY_ID, quirk_netmos);
 
 static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
 {
-        u16 command;
+        u16 command, pmcsr;
         u8 __iomem *csr;
         u8 cmd_hi;
+        int pm;
 
         switch (dev->device) {
         /* PCI IDs taken from drivers/net/e100.c */
@@ -1451,6 +1452,17 @@ static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
         if (!(command & PCI_COMMAND_MEMORY) || !pci_resource_start(dev, 0))
                 return;
 
+        /*
+         * Check that the device is in the D0 power state. If it's not,
+         * there is no point to look any further.
+         */
+        pm = pci_find_capability(dev, PCI_CAP_ID_PM);
+        if (pm) {
+                pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
+                if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0)
+                        return;
+        }
+
         /* Convert from PCI bus to resource space.  */
         csr = ioremap(pci_resource_start(dev, 0), 8);
         if (!csr) {