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Commit ec371326 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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usb-storage: support for more than 8 LUNs 



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: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 59e980ef

drivers/usb/storage/usb.c

+6 −0
Original line number Diff line number Diff line
@@ -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));