[libata sata_sil] remove incorrect limit on drive quirk

The original submittor of the quirk code noted that the errata
of a lockup creating when the condition "sector % 15 == 1" is
true only on chip revisions <= 1.  This is limitation on chip
revision is apparently not correct, therefore we apply to all
affected drives in the quirk list.

This is a sledgehammer fix, limiting max-sectors to 15.  A much better
fix would split the hardware request into two taskfiles, issuing
an additional command, thereby avoiding "sectors % 15 == 1"

Given the errata is limited to "sil 311x + <these drives>", it is hoped
that some janitor cares enough to do a real fix.

drivers/scsi/sata_sil.c

@@ -244,13 +244,9 @@ static void sil_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
 static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
 {
 	unsigned int n, quirks = 0;
-	u32 class_rev = 0;
 	const char *s = &dev->product[0];
 	unsigned int len = strnlen(s, sizeof(dev->product));
 
-	pci_read_config_dword(ap->host_set->pdev, PCI_CLASS_REVISION, &class_rev);
-	class_rev &= 0xff;
-
 	/* ATAPI specifies that empty space is blank-filled; remove blanks */
 	while ((len > 0) && (s[len - 1] == ' '))
 		len--;
@@ -263,7 +259,7 @@ static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
 		}
 	
 	/* limit requests to 15 sectors */
-	if ((class_rev <= 0x01) && (quirks & SIL_QUIRK_MOD15WRITE)) {
+	if (quirks & SIL_QUIRK_MOD15WRITE) {
 		printk(KERN_INFO "ata%u(%u): applying Seagate errata fix\n",
 		       ap->id, dev->devno);
 		ap->host->max_sectors = 15;
@@ -272,7 +268,6 @@ static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
 	}
 
 	/* limit to udma5 */
-	/* is this for (class_rev <= 0x01) only, too? */
 	if (quirks & SIL_QUIRK_UDMA5MAX) {
 		printk(KERN_INFO "ata%u(%u): applying Maxtor errata fix %s\n",
 		       ap->id, dev->devno, s);