[SCSI] aacraid: Fix extra unregister_chrdev

Received from Mark Salyzyn

If there are no aacraid controllers, we do not create the raid
controller chrdev, thus when the driver is unloaded it performs a
superfluous deregistration.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index fbd4f5538ac1..9437a4c8b64a 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -1023,7 +1023,8 @@ static int __init aac_init(void)
 
 static void __exit aac_exit(void)
 {
-        unregister_chrdev(aac_cfg_major, "aac");
+        if (aac_cfg_major > -1)
+                unregister_chrdev(aac_cfg_major, "aac");
         pci_unregister_driver(&aac_pci_driver);
 }