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, 4 insertions, 10 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 75bd6a8648f6..f75ade6f0602 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -587,10 +587,7 @@ DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8237,		quirk_via_v
  */
 static void __devinit quirk_amd_ioapic(struct pci_dev *dev)
 {
-        u8 rev;
-
-        pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
-        if (rev >= 0x02) {
+        if (dev->revision >= 0x02) {
                 printk(KERN_WARNING "I/O APIC: AMD Erratum #22 may be present. In the event of instability try\n");
                 printk(KERN_WARNING "        : booting with the \"noapic\" option.\n");
         }
@@ -610,13 +607,12 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SI,	PCI_ANY_ID,			quirk_ioapic_rmw );
 #define AMD8131_NIOAMODE_BIT 0
 static void quirk_amd_8131_ioapic(struct pci_dev *dev)
 { 
-        unsigned char revid, tmp;
+        unsigned char tmp;
         
         if (nr_ioapics == 0) 
                 return;
 
-        pci_read_config_byte(dev, PCI_REVISION_ID, &revid);
-        if (revid == AMD8131_revA0 || revid == AMD8131_revB0) {
+        if (dev->revision == AMD8131_revA0 || dev->revision == AMD8131_revB0) {
                 printk(KERN_INFO "Fixing up AMD8131 IOAPIC mode\n"); 
                 pci_read_config_byte( dev, AMD8131_MISC, &tmp);
                 tmp &= ~(1 << AMD8131_NIOAMODE_BIT);
@@ -859,10 +855,8 @@ DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_CYRIX,	PCI_DEVICE_ID_CYRIX_PCI_MASTER, qu
 static void quirk_disable_pxb(struct pci_dev *pdev)
 {
         u16 config;
-        u8 rev;
         
-        pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
-        if (rev != 0x04)                /* Only C0 requires this */
+        if (pdev->revision != 0x04)             /* Only C0 requires this */
                 return;
         pci_read_config_word(pdev, 0x40, &config);
         if (config & (1<<6)) {