usb-storage: add new no_read_disc_info quirk

Appotech ax3003 (the larger brother of the ax203) based devices are even
more buggy then the ax203.  They will go of into lala land when ever they
see a READ_DISC_INFO scsi command.  So add a new US_FL which tells the
scsi sr driver to not issue any READ_DISC_INFO scsi commands.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index e80362d148f3..a1128ff5cc2c 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -253,6 +253,10 @@ static int slave_configure(struct scsi_device *sdev)
                  * or to force 192-byte transfer lengths for MODE SENSE.
                  * But they do need to use MODE SENSE(10). */
                 sdev->use_10_for_ms = 1;
+
+                /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */
+                if (us->fflags & US_FL_NO_READ_DISC_INFO)
+                        sdev->no_read_disc_info = 1;
         }
 
         /* The CB and CBI transports have no way to pass LUN values