• Alan Stern's avatar
    USB: usb-storage: add BAD_SENSE flag · a0bb1081
    Alan Stern authored
    This patch (as1311) fixes a problem in usb-storage: Some devices are
    pretty broken when it comes to reporting sense data.  The information
    they send back indicates that they have more than 18 bytes of sense
    data available, but when the system asks for more than 18 they fail or
    hang.  The symptom is that probing fails with multiple resets.
    The patch adds a new BAD_SENSE flag to indicate that usb-storage
    should never ask for more than 18 bytes of sense data.  The flag can
    be set in an unusual_devs entry or via the "quirks=" module parameter,
    and it is set automatically whenever a REQUEST SENSE command for more
    than 18 bytes fails or times out.
    An unusual_devs entry is added for the Agfa photo frame, which uses a
    Prolific chip having this bug.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Tested-by: default avatarDaniel Kukula <daniel.kuku@gmail.com>
    Cc: stable <stable@kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>