[PATCH] scsi_scan: check return code from scsi_sysfs_add_sdev

Adds a missing check for an error return code from scsi_sysfs_add_sdev.
This resolves entry #4863 in the OSDL bugzilla.  Although in that bug
report the failure occurred because of a confusion over scanning vs.
rescanning, in general add_sdev can fail for a number of reasons (the
simplest being insufficient memory) and the caller should cope properly.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/scsi/scsi_scan.c

@@ -756,7 +756,8 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
 	 * register it and tell the rest of the kernel
 	 * about it.
 	 */
-	scsi_sysfs_add_sdev(sdev);
+	if (scsi_sysfs_add_sdev(sdev) != 0)
+		return SCSI_SCAN_NO_RESPONSE;
 
 	return SCSI_SCAN_LUN_PRESENT;
 }