Commit 17f06022 authored Oct 10, 2007 by Richard Sharpe Committed by Greg Kroah-Hartman Oct 12, 2007

USB: allow usbstorage to have LUNS greater than 2Tb



Attached is a very small patch (several comment lines) and a one-line
coded change) that allows for USB storage devices that are larger than
2TB.

At the company where I work we need such support, and one of my
co-workers, Jane Liu, pointed out that SCSI low-layer drivers need to
specify what size CDBs they accept. After looking through the code it
became obvious that the current USB Storage code accepted the default of
12-byte CDBs, so I changed it to accept 16-byte CDBs. This allows our
device to work.

Signed-off-by: Richard Sharpe <rsharpe@richardsharpe.com>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent eecfb911

drivers/usb/storage/usb.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -960,6 +960,10 @@ static int storage_probe(struct usb_interface *intf,
		return -ENOMEM;
		}

		/*
		* Allow 16-byte CDBs and thus > 2TB
		*/
		host->max_cmd_len = 16;
		us = host_to_us(host);
		memset(us, 0, sizeof(struct us_data));
		mutex_init(&(us->dev_mutex));