[PATCH] I2O: more error checking

i2o_scsi: handle sysfs failure

i2o_device:
 * convert i2o_device_add() to return integer error code
   rather than pointer.  Fortunately -nobody- checks the return code of
   this function, so changing has nil impact.
 * handle errors thrown by device_register()

More work in i2o_device remains.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/message/i2o/device.c

@@ -214,18 +214,17 @@ static struct i2o_device *i2o_device_alloc(void)
  *	Allocate a new I2O device and initialize it with the LCT entry. The
  *	device is appended to the device list of the controller.
  *
- *	Returns a pointer to the I2O device on success or negative error code
- *	on failure.
+ *	Returns zero on success, or a -ve errno.
  */
-static struct i2o_device *i2o_device_add(struct i2o_controller *c,
-					 i2o_lct_entry * entry)
+static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
 {
 	struct i2o_device *i2o_dev, *tmp;
+	int rc;
 
 	i2o_dev = i2o_device_alloc();
 	if (IS_ERR(i2o_dev)) {
 		printk(KERN_ERR "i2o: unable to allocate i2o device\n");
-		return i2o_dev;
+		return PTR_ERR(i2o_dev);
 	}
 
 	i2o_dev->lct_data = *entry;
@@ -236,7 +235,9 @@ static struct i2o_device *i2o_device_add(struct i2o_controller *c,
 	i2o_dev->iop = c;
 	i2o_dev->device.parent = &c->device;
 
-	device_register(&i2o_dev->device);
+	rc = device_register(&i2o_dev->device);
+	if (rc)
+		goto err;
 
 	list_add_tail(&i2o_dev->list, &c->devices);
 
@@ -270,7 +271,11 @@ static struct i2o_device *i2o_device_add(struct i2o_controller *c,
 
 	pr_debug("i2o: device %s added\n", i2o_dev->device.bus_id);
 
-	return i2o_dev;
+	return 0;
+
+err:
+	kfree(i2o_dev);
+	return rc;
 }
 
 /**

drivers/message/i2o/i2o_scsi.c

@@ -220,7 +220,7 @@ static int i2o_scsi_probe(struct device *dev)
 	u32 id = -1;
 	u64 lun = -1;
 	int channel = -1;
-	int i;
+	int i, rc;
 
 	i2o_shost = i2o_scsi_get_host(c);
 	if (!i2o_shost)
@@ -304,14 +304,20 @@ static int i2o_scsi_probe(struct device *dev)
 		return PTR_ERR(scsi_dev);
 	}
 
-	sysfs_create_link(&i2o_dev->device.kobj, &scsi_dev->sdev_gendev.kobj,
-			  "scsi");
+	rc = sysfs_create_link(&i2o_dev->device.kobj,
+			       &scsi_dev->sdev_gendev.kobj, "scsi");
+	if (rc)
+		goto err;
 
 	osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n",
 		 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
 		 (long unsigned int)le64_to_cpu(lun));
 
 	return 0;
+
+err:
+	scsi_remove_device(scsi_dev);
+	return rc;
 };
 
 static const char *i2o_scsi_info(struct Scsi_Host *SChost)