[PATCH] fix oops caused when writing to the rescan attribute

[Mike Christie <mikenc@us.ibm.com>]

[-- Attachment #1: Type: text/plain, Size: 244 bytes --]

If an upper layer driver is not loaded, and you write to a device's 
rescan attribute you will get an oops. The attached patch fixes this by 
testing if the device's driver variable is set before accessing it.


Mike Christie
mikenc@us.ibm.com

[-- Attachment #2: sysfs_rescan.patch --]
[-- Type: text/plain, Size: 479 bytes --]

--- linux-2.6.0-test6/drivers/scsi/scsi_scan.c	2003-09-27 17:50:40.000000000 -0700
+++ linux-2.6.0-test6-work/drivers/scsi/scsi_scan.c	2003-09-30 04:12:25.000000000 -0700
@@ -1080,8 +1080,12 @@
 
 void scsi_rescan_device(struct device *dev)
 {
-	struct scsi_driver *drv = to_scsi_driver(dev->driver);
+	struct scsi_driver *drv;
+	
+	if (!dev->driver)
+		return;
 
+	drv = to_scsi_driver(dev->driver);
 	if (try_module_get(drv->owner)) {
 		if (drv->rescan)
 			drv->rescan(dev);