PCI: Change all drivers to use pci_device->revision

Instead of all drivers reading pci config space to get the revision
ID, they can now use the pci_device->revision member.

This exposes some issues where drivers where reading a word or a dword
for the revision number, and adding useless error-handling around the
read. Some drivers even just read it for no purpose of all.

In devices where the revision ID is being copied over and used in what
appears to be the equivalent of hotpath, I have left the copy code
and the cached copy as not to influence the driver's performance.

Compile tested with make all{yes,mod}config on x86_64 and i386.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Acked-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 6a3bfef58e13..2610db75f984 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -928,20 +928,18 @@ static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
 {
         struct pci_dev *pdev = NULL;
         u16 cfg;
-        u8 rev;
         int no_piix_dma = 0;
 
         while((pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev)) != NULL)
         {
                 /* Look for 450NX PXB. Check for problem configurations
                    A PCI quirk checks bit 6 already */
-                pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
                 pci_read_config_word(pdev, 0x41, &cfg);
                 /* Only on the original revision: IDE DMA can hang */
-                if (rev == 0x00)
+                if (pdev->revision == 0x00)
                         no_piix_dma = 1;
                 /* On all revisions below 5 PXB bus lock must be disabled for IDE */
-                else if (cfg & (1<<14) && rev < 5)
+                else if (cfg & (1<<14) && pdev->revision < 5)
                         no_piix_dma = 2;
         }
         if (no_piix_dma)