usb-storage: support for more than 8 LUNs
authorOliver Neukum <oneukum@suse.de>
Tue, 10 Feb 2015 08:27:59 +0000 (09:27 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 24 Feb 2015 16:38:46 +0000 (08:38 -0800)
This is necessary to make some storage arrays work.

Some storage devices have more than 8 LUNs. In addition
you can hook up a WideSCSI bus to USB. In these cases even
level 2 devices can have more than 8 LUNs. For them
it is necessary to simply believe the class specific
command and report its result back to the SCSI layer.

Off by one Alan noticed is fixed.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/storage/usb.c

index d468d02..5600c33 100644 (file)
@@ -889,6 +889,12 @@ static void usb_stor_scan_dwork(struct work_struct *work)
            !(us->fflags & US_FL_SCM_MULT_TARG)) {
                mutex_lock(&us->dev_mutex);
                us->max_lun = usb_stor_Bulk_max_lun(us);
+               /*
+                * Allow proper scanning of devices that present more than 8 LUNs
+                * While not affecting other devices that may need the previous behavior
+                */
+               if (us->max_lun >= 8)
+                       us_to_host(us)->max_lun = us->max_lun+1;
                mutex_unlock(&us->dev_mutex);
        }
        scsi_scan_host(us_to_host(us));