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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>
hifive-unleashed-5.1
Ivan Kokshaysky 2007-12-18 00:39:27 +03:00 committed by Greg Kroah-Hartman
parent 3609801ecc
commit e64aeccbec
1 changed files with 13 additions and 1 deletions
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14
drivers/pci/quirks.c
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@ -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) {