From 1edab4a164b229807853682f7ff7858c11dd3481 Mon Sep 17 00:00:00 2001 From: Brice Goglin Date: Tue, 23 May 2006 03:05:27 -0400 Subject: [PATCH] [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 Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index f8105783da2f..4aea563bda60 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -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; @@ -925,8 +926,9 @@ int pci_enable_msi(struct pci_dev* dev) if (dev->no_msi) return status; - if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) - return -EINVAL; + 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;