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, 1 insertions, 3 deletions

diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index b9c44c575ce..b09facad63e 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -623,17 +623,15 @@ static int amd_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         const struct ata_port_info *ppi[] = { NULL, NULL };
         static int printed_version;
         int type = id->driver_data;
-        u8 rev;
         u8 fifo;
 
         if (!printed_version++)
                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
-        pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
         pci_read_config_byte(pdev, 0x41, &fifo);
 
         /* Check for AMD7409 without swdma errata and if found adjust type */
-        if (type == 1 && rev > 0x7)
+        if (type == 1 && pdev->revision > 0x7)
                 type = 2;
 
         /* Check for AMD7411 */