[PATCH] hpt37x: Check the enablebits

Helps for PATA but SATA bridged devices lie and always set all the bits
so will need the error handling fixes from Tejun.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/pata_hpt37x.c

@@ -25,7 +25,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME	"pata_hpt37x"
-#define DRV_VERSION	"0.5"
+#define DRV_VERSION	"0.5.1"
 
 struct hpt_clock {
 	u8	xfer_speed;
@@ -453,7 +453,13 @@ static int hpt37x_pre_reset(struct ata_port *ap)
 {
 	u8 scr2, ata66;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-
+	static const struct pci_bits hpt37x_enable_bits[] = {
+		{ 0x50, 1, 0x04, 0x04 },
+		{ 0x54, 1, 0x04, 0x04 }
+	};
+	if (!pci_test_config_bits(pdev, &hpt37x_enable_bits[ap->port_no]))
+		return -ENOENT;
+
 	pci_read_config_byte(pdev, 0x5B, &scr2);
 	pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
 	/* Cable register now active */
@@ -488,10 +494,17 @@ static void hpt37x_error_handler(struct ata_port *ap)
 
 static int hpt374_pre_reset(struct ata_port *ap)
 {
+	static const struct pci_bits hpt37x_enable_bits[] = {
+		{ 0x50, 1, 0x04, 0x04 },
+		{ 0x54, 1, 0x04, 0x04 }
+	};
 	u16 mcr3, mcr6;
 	u8 ata66;
-
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+	if (!pci_test_config_bits(pdev, &hpt37x_enable_bits[ap->port_no]))
+		return -ENOENT;
+
 	/* Do the extra channel work */
 	pci_read_config_word(pdev, 0x52, &mcr3);
 	pci_read_config_word(pdev, 0x56, &mcr6);