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, 3 insertions, 10 deletions

diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 1371b5bf6bf0..ed04e0c8dd4c 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -55,7 +55,6 @@ static const char *svwks_bad_ata100[] = {
         NULL
 };
 
-static u8 svwks_revision = 0;
 static struct pci_dev *isa_dev;
 
 static int check_in_drive_lists (ide_drive_t *drive, const char **list)
@@ -71,9 +70,6 @@ static u8 svwks_udma_filter(ide_drive_t *drive)
         struct pci_dev *dev     = HWIF(drive)->pci_dev;
         u8 mask = 0;
 
-        if (!svwks_revision)
-                pci_read_config_byte(dev, PCI_REVISION_ID, &svwks_revision);
-
         if (dev->device == PCI_DEVICE_ID_SERVERWORKS_HT1000IDE)
                 return 0x1f;
         if (dev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
@@ -88,9 +84,9 @@ static u8 svwks_udma_filter(ide_drive_t *drive)
                         return 0;
                 /* Check the OSB4 DMA33 enable bit */
                 return ((reg & 0x00004000) == 0x00004000) ? 0x07 : 0;
-        } else if (svwks_revision < SVWKS_CSB5_REVISION_NEW) {
+        } else if (dev->revision < SVWKS_CSB5_REVISION_NEW) {
                 return 0x07;
-        } else if (svwks_revision >= SVWKS_CSB5_REVISION_NEW) {
+        } else if (dev->revision >= SVWKS_CSB5_REVISION_NEW) {
                 u8 btr = 0, mode;
                 pci_read_config_byte(dev, 0x5A, &btr);
                 mode = btr & 0x3;
@@ -234,9 +230,6 @@ static unsigned int __devinit init_chipset_svwks (struct pci_dev *dev, const cha
         unsigned int reg;
         u8 btr;
 
-        /* save revision id to determine DMA capability */
-        pci_read_config_byte(dev, PCI_REVISION_ID, &svwks_revision);
-
         /* force Master Latency Timer value to 64 PCICLKs */
         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40);
 
@@ -315,7 +308,7 @@ static unsigned int __devinit init_chipset_svwks (struct pci_dev *dev, const cha
                 if (!(PCI_FUNC(dev->devfn) & 1))
                         btr |= 0x2;
                 else
-                        btr |= (svwks_revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
+                        btr |= (dev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
                 pci_write_config_byte(dev, 0x5A, btr);
         }
         /* Setup HT1000 SouthBridge Controller - Single Channel Only */