[PATCH v3] mpt2sas: use pci_dev->revision

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

The driver reads PCI revision ID from the PCI configuration register while it's
already stored by PCI subsystem in the 'revision' field of 'struct pci_dev'...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>

---
The patch is against the recent Linus' tree.
It wasn't merged in either 2.6.39, 3.0, or 3.1 time, hopefully it can be merged
to 3.2...

Andrew, the SCSI maintainer seems to ignore this patch, maybe you can queue it?

 drivers/scsi/mpt2sas/mpt2sas_base.c |    4 +---
 drivers/scsi/mpt2sas/mpt2sas_ctl.c  |    4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

Index: linux-2.6/drivers/scsi/mpt2sas/mpt2sas_base.c
===================================================================
--- linux-2.6.orig/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ linux-2.6/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1830,12 +1830,10 @@ _base_display_ioc_capabilities(struct MP
 {
 	int i = 0;
 	char desc[16];
-	u8 revision;
 	u32 iounit_pg1_flags;
 	u32 bios_version;
 
 	bios_version = le32_to_cpu(ioc->bios_pg3.BiosVersion);
-	pci_read_config_byte(ioc->pdev, PCI_CLASS_REVISION, &revision);
 	strncpy(desc, ioc->manu_pg0.ChipName, 16);
 	printk(MPT2SAS_INFO_FMT "%s: FWVersion(%02d.%02d.%02d.%02d), "
 	   "ChipRevision(0x%02x), BiosVersion(%02d.%02d.%02d.%02d)\n",
@@ -1844,7 +1842,7 @@ _base_display_ioc_capabilities(struct MP
 	   (ioc->facts.FWVersion.Word & 0x00FF0000) >> 16,
 	   (ioc->facts.FWVersion.Word & 0x0000FF00) >> 8,
 	   ioc->facts.FWVersion.Word & 0x000000FF,
-	   revision,
+	   ioc->pdev->revision,
 	   (bios_version & 0xFF000000) >> 24,
 	   (bios_version & 0x00FF0000) >> 16,
 	   (bios_version & 0x0000FF00) >> 8,
Index: linux-2.6/drivers/scsi/mpt2sas/mpt2sas_ctl.c
===================================================================
--- linux-2.6.orig/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ linux-2.6/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -1027,7 +1027,6 @@ _ctl_getiocinfo(void __user *arg)
 {
 	struct mpt2_ioctl_iocinfo karg;
 	struct MPT2SAS_ADAPTER *ioc;
-	u8 revision;
 
 	if (copy_from_user(&karg, arg, sizeof(karg))) {
 		printk(KERN_ERR "failure at %s:%d/%s()!\n",
@@ -1047,8 +1046,7 @@ _ctl_getiocinfo(void __user *arg)
 		karg.adapter_type = MPT2_IOCTL_INTERFACE_SAS2;
 	if (ioc->pfacts)
 		karg.port_number = ioc->pfacts[0].PortNumber;
-	pci_read_config_byte(ioc->pdev, PCI_CLASS_REVISION, &revision);
-	karg.hw_rev = revision;
+	karg.hw_rev = ioc->pdev->revision;
 	karg.pci_id = ioc->pdev->device;
 	karg.subsystem_device = ioc->pdev->subsystem_device;
 	karg.subsystem_vendor = ioc->pdev->subsystem_vendor;