scsi/sr: add no_read_disc_info scsi_device flag
Hans de Goede [Fri, 1 Oct 2010 21:20:08 +0000 (14:20 -0700)]
Some USB devices emulate a usb-mass-storage attached (scsi) cdrom device,
usually this fake cdrom contains the windows software for the device.
While working on supporting Appotech ax3003 based photoframes, which do
this I discovered that they will go of into lala land when ever they see a
READ_DISC_INFO scsi command.

Thus this patch adds a scsi_device flag (which can then be set by the
usb-storage driver through an unsual-devs entry), to indicate this, and
makes the sr driver honor this flag.

I know this sucks, but as discussed on linux-scsi list there is no other
way to make this device work properly.

Looking at usb traces made under windows, windows never sends a
READ_DISC_INFO during normal interactions with a usb cdrom device.  So as
this cdrom emulation thingie becomes more common we might see more of this
problem.

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>

drivers/scsi/sr.c
include/scsi/scsi_device.h

index ba9c3e0..b811dd0 100644 (file)
@@ -862,10 +862,16 @@ static void get_capabilities(struct scsi_cd *cd)
 static int sr_packet(struct cdrom_device_info *cdi,
                struct packet_command *cgc)
 {
+       struct scsi_cd *cd = cdi->handle;
+       struct scsi_device *sdev = cd->device;
+
+       if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
+               return -EDRIVE_CANT_DO_THIS;
+
        if (cgc->timeout <= 0)
                cgc->timeout = IOCTL_TIMEOUT;
 
-       sr_do_ioctl(cdi->handle, cgc);
+       sr_do_ioctl(cd, cgc);
 
        return cgc->stat;
 }
index 50cb34f..e8c2433 100644 (file)
@@ -148,6 +148,7 @@ struct scsi_device {
        unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
        unsigned last_sector_bug:1;     /* do not use multisector accesses on
                                           SD_LAST_BUGGY_SECTORS */
+       unsigned no_read_disc_info:1;   /* Avoid READ_DISC_INFO cmds */
        unsigned is_visible:1;  /* is the device visible in sysfs */
 
        DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */