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>

5 files changed, 12 insertions, 40 deletions

diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index 0d3a38b1cb0b..77637e780d41 100644
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -1704,7 +1704,6 @@ static int __devinit eni_do_init(struct atm_dev *dev)
 	struct pci_dev *pci_dev;
 	unsigned long real_base;
 	void __iomem *base;
-	unsigned char revision;
 	int error,i,last;
 
 	DPRINTK(">eni_init\n");
@@ -1715,12 +1714,6 @@ static int __devinit eni_do_init(struct atm_dev *dev)
 	pci_dev = eni_dev->pci_dev;
 	real_base = pci_resource_start(pci_dev, 0);
 	eni_dev->irq = pci_dev->irq;
-	error = pci_read_config_byte(pci_dev,PCI_REVISION_ID,&revision);
-	if (error) {
-		printk(KERN_ERR DEV_LABEL "(itf %d): init error 0x%02x\n",
-		    dev->number,error);
-		return -EINVAL;
-	}
 	if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
 	    PCI_COMMAND_MEMORY |
 	    (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
@@ -1729,7 +1722,7 @@ static int __devinit eni_do_init(struct atm_dev *dev)
 		return -EIO;
 	}
 	printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
-	    dev->number,revision,real_base,eni_dev->irq);
+	    dev->number,pci_dev->revision,real_base,eni_dev->irq);
 	if (!(base = ioremap_nocache(real_base,MAP_MAX_SIZE))) {
 		printk("\n");
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index 3800bc0cb2ef..8f995ce8d73b 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -3679,7 +3679,6 @@ idt77252_init_one(struct pci_dev *pcidev, const struct pci_device_id *id)
 	unsigned long membase, srambase;
 	struct idt77252_dev *card;
 	struct atm_dev *dev;
-	ushort revision = 0;
 	int i, err;
 
 
@@ -3688,19 +3687,13 @@ idt77252_init_one(struct pci_dev *pcidev, const struct pci_device_id *id)
 		return err;
 	}
 
-	if (pci_read_config_word(pcidev, PCI_REVISION_ID, &revision)) {
-		printk("idt77252-%d: can't read PCI_REVISION_ID\n", index);
-		err = -ENODEV;
-		goto err_out_disable_pdev;
-	}
-
 	card = kzalloc(sizeof(struct idt77252_dev), GFP_KERNEL);
 	if (!card) {
 		printk("idt77252-%d: can't allocate private data\n", index);
 		err = -ENOMEM;
 		goto err_out_disable_pdev;
 	}
-	card->revision = revision;
+	card->revision = pcidev->revision;
 	card->index = index;
 	card->pcidev = pcidev;
 	sprintf(card->name, "idt77252-%d", card->index);
@@ -3762,8 +3755,8 @@ idt77252_init_one(struct pci_dev *pcidev, const struct pci_device_id *id)
 	}
 
 	printk("%s: ABR SAR (Rev %c): MEM %08lx SRAM %08lx [%u KB]\n",
-	       card->name, ((revision > 1) && (revision < 25)) ?
-	       'A' + revision - 1 : '?', membase, srambase,
+	       card->name, ((card->revision > 1) && (card->revision < 25)) ?
+	       'A' + card->revision - 1 : '?', membase, srambase,
 	       card->sramsize / 1024);
 
 	if (init_card(dev)) {
diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index bb7ef570514c..a3b605a0ca17 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -2290,7 +2290,6 @@ static int __devinit ia_init(struct atm_dev *dev)
 	unsigned long real_base;
 	void __iomem *base;
 	unsigned short command;  
-	unsigned char revision;  
 	int error, i; 
 	  
 	/* The device has been identified and registered. Now we read   
@@ -2305,16 +2304,14 @@ static int __devinit ia_init(struct atm_dev *dev)
 	real_base = pci_resource_start (iadev->pci, 0);
 	iadev->irq = iadev->pci->irq;
 		  
-	if ((error = pci_read_config_word(iadev->pci, PCI_COMMAND,&command))   
-		    || (error = pci_read_config_byte(iadev->pci,   
-				PCI_REVISION_ID,&revision)))   
-	{  
+	error = pci_read_config_word(iadev->pci, PCI_COMMAND, &command);
+	if (error) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): init error 0x%x\n",  
 				dev->number,error);  
 		return -EINVAL;  
 	}  
 	IF_INIT(printk(DEV_LABEL "(itf %d): rev.%d,realbase=0x%lx,irq=%d\n",  
-			dev->number, revision, real_base, iadev->irq);)  
+			dev->number, iadev->pci->revision, real_base, iadev->irq);)
 	  
 	/* find mapping size of board */  
 	  
@@ -2353,7 +2350,7 @@ static int __devinit ia_init(struct atm_dev *dev)
 		return error;  
 	}  
 	IF_INIT(printk(DEV_LABEL " (itf %d): rev.%d,base=%p,irq=%d\n",  
-			dev->number, revision, base, iadev->irq);)  
+			dev->number, iadev->pci->revision, base, iadev->irq);)
 	  
 	/* filling the iphase dev structure */  
 	iadev->mem = iadev->pci_map_size /2;  
diff --git a/drivers/atm/lanai.c b/drivers/atm/lanai.c
index 09f477d4237a..203c70378b15 100644
--- a/drivers/atm/lanai.c
+++ b/drivers/atm/lanai.c
@@ -293,7 +293,6 @@ struct lanai_dev {
 	struct atm_vcc *cbrvcc;
 	int number;
 	int board_rev;
-	u8 pci_revision;
 /* TODO - look at race conditions with maintence of conf1/conf2 */
 /* TODO - transmit locking: should we use _irq not _irqsave? */
 /* TODO - organize above in some rational fashion (see <asm/cache.h>) */
@@ -1969,14 +1968,6 @@ static int __devinit lanai_pci_start(struct lanai_dev *lanai)
 		    "(itf %d): No suitable DMA available.\n", lanai->number);
 		return -EBUSY;
 	}
-	/* Get the pci revision byte */
-	result = pci_read_config_byte(pci, PCI_REVISION_ID,
-	    &lanai->pci_revision);
-	if (result != PCIBIOS_SUCCESSFUL) {
-		printk(KERN_ERR DEV_LABEL "(itf %d): can't read "
-		    "PCI_REVISION_ID: %d\n", lanai->number, result);
-		return -EINVAL;
-	}
 	result = pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &w);
 	if (result != PCIBIOS_SUCCESSFUL) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): can't read "
@@ -2254,7 +2245,7 @@ static int __devinit lanai_dev_open(struct atm_dev *atmdev)
 	lanai_timed_poll_start(lanai);
 	printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d, base=0x%lx, irq=%u "
 	    "(%02X-%02X-%02X-%02X-%02X-%02X)\n", lanai->number,
-	    (int) lanai->pci_revision, (unsigned long) lanai->base,
+	    (int) lanai->pci->revision, (unsigned long) lanai->base,
 	    lanai->pci->irq,
 	    atmdev->esi[0], atmdev->esi[1], atmdev->esi[2],
 	    atmdev->esi[3], atmdev->esi[4], atmdev->esi[5]);
@@ -2491,7 +2482,7 @@ static int lanai_proc_read(struct atm_dev *atmdev, loff_t *pos, char *page)
 		    (unsigned int) lanai->magicno, lanai->num_vci);
 	if (left-- == 0)
 		return sprintf(page, "revision: board=%d, pci_if=%d\n",
-		    lanai->board_rev, (int) lanai->pci_revision);
+		    lanai->board_rev, (int) lanai->pci->revision);
 	if (left-- == 0)
 		return sprintf(page, "EEPROM ESI: "
 		    "%02X:%02X:%02X:%02X:%02X:%02X\n",
diff --git a/drivers/atm/zatm.c b/drivers/atm/zatm.c
index 2ad2527cf5b3..020a87a476c8 100644
--- a/drivers/atm/zatm.c
+++ b/drivers/atm/zatm.c
@@ -1182,7 +1182,6 @@ static int __devinit zatm_init(struct atm_dev *dev)
 	struct zatm_dev *zatm_dev;
 	struct pci_dev *pci_dev;
 	unsigned short command;
-	unsigned char revision;
 	int error,i,last;
 	unsigned long t0,t1,t2;
 
@@ -1192,8 +1191,7 @@ static int __devinit zatm_init(struct atm_dev *dev)
 	pci_dev = zatm_dev->pci_dev;
 	zatm_dev->base = pci_resource_start(pci_dev, 0);
 	zatm_dev->irq = pci_dev->irq;
-	if ((error = pci_read_config_word(pci_dev,PCI_COMMAND,&command)) ||
-	    (error = pci_read_config_byte(pci_dev,PCI_REVISION_ID,&revision))) {
+	if ((error = pci_read_config_word(pci_dev,PCI_COMMAND,&command))) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): init error 0x%02x\n",
 		    dev->number,error);
 		return -EINVAL;
@@ -1206,7 +1204,7 @@ static int __devinit zatm_init(struct atm_dev *dev)
 	}
 	eprom_get_esi(dev);
 	printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%x,irq=%d,",
-	    dev->number,revision,zatm_dev->base,zatm_dev->irq);
+	    dev->number,pci_dev->revision,zatm_dev->base,zatm_dev->irq);
 	/* reset uPD98401 */
 	zout(0,SWR);
 	while (!(zin(GSR) & uPD98401_INT_IND));