[SCSI] I2O: move pci_request_regions() just behind pci_enable_device()

The problem in dpt_i2o could be the pci config space accesses it
triggers as it loads, dangerous to do if there is any I/O activity going
on in the other driver (probable if a boot driver I guess).

I approve this patch to dpt_i2o.c, and am applying it to the Adaptec
branch of the driver.

Thanks for the investigation Ryoji.

---

In linux 2.6.15, data transfer does hang when both dpt_i2o
and i2o_block drivers are loaded.
It seems that location of pci_request_regions() are wrong.
I moved it just behind pci_enable_device() like other drivers,
and it becomes fine.

Signed-off-by: Ryoji Kamei <kamei@miraclelinux.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/message/i2o/pci.c

@@ -88,11 +88,6 @@ static int __devinit i2o_pci_alloc(struct i2o_controller *c)
 	struct device *dev = &pdev->dev;
 	int i;
 
-	if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
-		printk(KERN_ERR "%s: device already claimed\n", c->name);
-		return -ENODEV;
-	}
-
 	for (i = 0; i < 6; i++) {
 		/* Skip I/O spaces */
 		if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
@@ -319,6 +314,11 @@ static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 		return rc;
 	}
 
+	if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
+		printk(KERN_ERR "i2o: device already claimed\n", c->name);
+		return -ENODEV;
+	}
+
 	if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
 		printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 		       pci_name(pdev));

drivers/scsi/dpt_i2o.c

@@ -899,6 +899,12 @@ static int adpt_install_hba(struct scsi_host_template* sht, struct pci_dev* pDev
 	if(pci_enable_device(pDev)) {
 		return -EINVAL;
 	}
+
+	if (pci_request_regions(pDev, "dpt_i2o")) {
+		PERROR("dpti: adpt_config_hba: pci request region failed\n");
+		return -EINVAL;
+	}
+
 	pci_set_master(pDev);
 	if (pci_set_dma_mask(pDev, 0xffffffffffffffffULL) &&
 	    pci_set_dma_mask(pDev, 0xffffffffULL))
@@ -924,10 +930,6 @@ static int adpt_install_hba(struct scsi_host_template* sht, struct pci_dev* pDev
 		raptorFlag = TRUE;
 	}
 
-	if (pci_request_regions(pDev, "dpt_i2o")) {
-		PERROR("dpti: adpt_config_hba: pci request region failed\n");
-		return -EINVAL;
-	}
 	base_addr_virt = ioremap(base_addr0_phys,hba_map0_area_size);
 	if (!base_addr_virt) {
 		pci_release_regions(pDev);