PCI: Add quirk for devices which disable MSI when INTX_DISABLE is set.

A reasonably common problem with some devices is that they will
disable MSI generation when the INTX_DISABLE bit is set in the
PCI_COMMAND register.

Quirk this explicitly, guarding the pci_intx() calls in msi.c with
this quirk indication.

The first entries for this quirk are for 5714 and 5780 Tigon3 chips,
and thus we can remove the workaround code from the tg3.c driver.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michael Chan <mchan@broadcom.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5d2281f661f7..7c04f38e6ac3 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -109,6 +109,14 @@ enum pcie_reset_state {
         pcie_hot_reset = (__force pcie_reset_state_t) 3
 };
 
+typedef unsigned short __bitwise pci_dev_flags_t;
+enum pci_dev_flags {
+        /* INTX_DISABLE in PCI_COMMAND register disables MSI
+         * generation too.
+         */
+        PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1,
+};
+
 typedef unsigned short __bitwise pci_bus_flags_t;
 enum pci_bus_flags {
         PCI_BUS_FLAGS_NO_MSI   = (__force pci_bus_flags_t) 1,
@@ -185,6 +193,7 @@ struct pci_dev {
         unsigned int    msix_enabled:1;
         unsigned int    is_managed:1;
         unsigned int    is_pcie:1;
+        pci_dev_flags_t dev_flags;
         atomic_t        enable_cnt;     /* pci_enable_device has been called */
 
         u32             saved_config_space[16]; /* config space saved at suspend time */