usb-storage: enable multi-LUN scanning when needed

commit 823d12c95c666fa7ab7dad208d735f6bc6afabdc upstream.

People sometimes create their own custom-configured kernels and forget
to enable CONFIG_SCSI_MULTI_LUN.  This causes problems when they plug
in a USB storage device (such as a card reader) with more than one
LUN.

Fortunately, we can tell fairly easily when a storage device claims to
have more than one LUN.  When that happens, this patch asks the SCSI
layer to probe all the LUNs automatically, regardless of the config
setting.

The patch also updates the Kconfig help text for usb-storage,
explaining that CONFIG_SCSI_MULTI_LUN may be necessary.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Thomas Raschbacher <lordvan@lordvan.com>
CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
CC: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2:
 - Adjust context
 - slave_alloc() already has a us_data pointer]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/storage/Kconfig b/drivers/usb/storage/Kconfig
index 303c34b..3460ee8 100644 (file)
--- a/drivers/usb/storage/Kconfig
+++ b/drivers/usb/storage/Kconfig
@@ -19,7 +19,9 @@ config USB_STORAGE
 
          This option depends on 'SCSI' support being enabled, but you
          probably also need 'SCSI device support: SCSI disk support'
-         (BLK_DEV_SD) for most USB storage devices.
+         (BLK_DEV_SD) for most USB storage devices.  Some devices also
+         will require 'Probe all LUNs on each SCSI device'
+         (SCSI_MULTI_LUN).
 
          To compile this driver as a module, choose M here: the
          module will be called usb-storage.

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 13b8bcd..eb660bb 100644 (file)
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -116,6 +116,10 @@ static int slave_alloc (struct scsi_device *sdev)
        if (us->subclass == USB_SC_UFI)
                sdev->sdev_target->pdt_1f_for_no_lun = 1;
 
+       /* Tell the SCSI layer if we know there is more than one LUN */
+       if (us->protocol == USB_PR_BULK && us->max_lun > 0)
+               sdev->sdev_bflags |= BLIST_FORCELUN;
+
        return 0;
 }