diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2010-10-02 01:20:08 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 21:22:04 +0400 |
| commit | 8e04d8056c1ea0e0aab730994b74756f0526cda8 (patch) | |
| tree | b81a3e2f5993c69559d120fa96840e1ef70b42d4 | |
| parent | 319feaabb6c7ccd90da6e3207563c265da7d21ae (diff) | |
| download | linux-8e04d8056c1ea0e0aab730994b74756f0526cda8.tar.xz | |
scsi/sr: add no_read_disc_info scsi_device flag
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>
| -rw-r--r-- | drivers/scsi/sr.c | 8 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 1 |
2 files changed, 8 insertions, 1 deletions
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index ba9c3e0387ce..b811dd0eb240 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -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; } diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 50cb34ffef11..e8c2433ad8a8 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -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 */ |