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[PATCH] PCI: AMD 8131 MSI quirk called too late, bus_flags not inherited ? 

The PCI_BUS_FLAGS_NO_MSI bus flags does not appear do be inherited
correctly from the amd8131 MSI quirk to its parent busses. It makes
devices behind a bridge behind amd8131 try to enable MSI while the
amd8131 does not support it.
We fix this by looking at flags of all parent busses in
pci_enable_msi() and pci_enable_msix().

By the way, also add the missing dev->no_msi check in pci_enable_msix()

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Brice Goglin 2006-05-23 03:05:27 -04:00 committed by Greg Kroah-Hartman
parent 74d0a988d3
commit 1edab4a164
1 changed files with 12 additions and 2 deletions
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12
drivers/pci/msi.c
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@ -916,6 +916,7 @@ static int msix_capability_init(struct pci_dev *dev,
**/
int pci_enable_msi(struct pci_dev* dev)
{
struct pci_bus *bus;
int pos, temp, status = -EINVAL;
u16 control;
@ -925,7 +926,8 @@ int pci_enable_msi(struct pci_dev* dev)
if (dev->no_msi)
return status;
if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
for (bus = dev->bus; bus; bus = bus->parent)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;
temp = dev->irq;
@ -1162,6 +1164,7 @@ static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec)
**/
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
{
struct pci_bus *bus;
int status, pos, nr_entries, free_vectors;
int i, j, temp;
u16 control;
@ -1170,6 +1173,13 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
if (!pci_msi_enable || !dev || !entries)
return -EINVAL;
if (dev->no_msi)
return -EINVAL;
for (bus = dev->bus; bus; bus = bus->parent)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;
status = msi_init();
if (status < 0)
return status;