[PATCH 2/2] dpt_i2o: 64 bit support (take 4)

[Miquel van Smoorenburg <miquels@cistron.nl>]

sysfs code.

# -------

This patch is an update for drivers/scsi/dpt_i2o.c.
It applies to both 2.6.24.4 and 2.6.25

It contains the following changes:

* 64 bit code based on unofficial Adaptec 64 bit driver
* removes scsi_module.c dependency, adds module_init / module_exit
  this is needed because we need to pass the proper device to
  scsi_add_host(), and the scsi_module.c passes NULL. With NULL,
  code like arch/x64/kernel/pci-gart_64.c::need_iommu() crashes
  because the dev pointer it is passed is NULL.
* adds sysfs entry for /sys/class/dpt_i2o/dptiX so that udev
  can create /dev/dptiX dynamically

Obviously there are more cleanups that can be done to this code,
but we need to start somewhere. Patch has been tested heavily on
both 32 and 64 bit x86 platforms.

Signed-off-by: Miquel van Smoorenburg <miquels@cistron.nl>

diff -ruN linux-2.6.25/drivers/scsi/dpt_i2o.c linux-2.6.25-sysfs/drivers/scsi/dpt_i2o.c
--- linux-2.6.25/drivers/scsi/dpt_i2o.c	2008-04-24 22:30:29.000000000 +0200
+++ linux-2.6.25-sysfs/drivers/scsi/dpt_i2o.c	2008-04-24 23:26:08.000000000 +0200
@@ -116,6 +116,8 @@
 static adpt_hba* hba_chain = NULL;
 static int hba_count = 0;
 
+static struct class *adpt_sysfs_class;
+
 #ifdef CONFIG_COMPAT
 static long compat_adpt_ioctl(struct file *, unsigned int, unsigned long);
 #endif
@@ -259,6 +261,10 @@
 		adpt_inquiry(pHba);
 	}
 
+	adpt_sysfs_class = class_create(THIS_MODULE, "dpt_i2o");
+	if (IS_ERR(adpt_sysfs_class))
+		adpt_sysfs_class = NULL;
+
 	for (pHba = hba_chain; pHba; pHba = pHba->next) {
 		if (adpt_scsi_host_alloc(pHba, sht) < 0){
 			adpt_i2o_delete_hba(pHba);
@@ -266,6 +272,11 @@
 		}
 		pHba->initialized = TRUE;
 		pHba->state &= ~DPTI_STATE_RESET;
+		if (adpt_sysfs_class) {
+			class_device_create(adpt_sysfs_class,
+				NULL, MKDEV(DPTI_I2O_MAJOR, pHba->unit),
+				NULL, "dpti%d", pHba->unit);
+		}
 	}
 
 	// Register our control device node
@@ -1220,8 +1231,17 @@
 	pci_dev_put(pHba->pDev);
 	kfree(pHba);
 
-	if(hba_count <= 0)
+	if (adpt_sysfs_class)
+		class_device_destroy(adpt_sysfs_class,
+				MKDEV(DPTI_I2O_MAJOR, pHba->unit));
+
+	if(hba_count <= 0){
 		unregister_chrdev(DPTI_I2O_MAJOR, DPT_DRIVER);   
+		if (adpt_sysfs_class) {
+			class_destroy(adpt_sysfs_class);
+			adpt_sysfs_class = NULL;
+		}
+	}
 }
 
 static struct adpt_device* adpt_find_device(adpt_hba* pHba, u32 chan, u32 id, u32 lun)