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    Subject[PATCH 4.9 82/86] usb: uas: unconditionally bring back host after reset
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Oliver Neukum <oneukum@suse.com>

    commit cbeef22fd611c4f47c494b821b2b105b8af970bb upstream.

    Quoting Hans:

    If we return 1 from our post_reset handler, then our disconnect handler
    will be called immediately afterwards. Since pre_reset blocks all scsi
    requests our disconnect handler will then hang in the scsi_remove_host
    call.

    This is esp. bad because our disconnect handler hanging for ever also
    stops the USB subsys from enumerating any new USB devices, causes commands
    like lsusb to hang, etc.

    In practice this happens when unplugging some uas devices because the hub
    code may see the device as needing a warm-reset and calls usb_reset_device
    before seeing the disconnect. In this case uas_configure_endpoints fails
    with -ENODEV. We do not want to print an error for this, so this commit
    also silences the shost_printk for -ENODEV.

    ENDQUOTE

    However, if we do that we better drop any unconditional execution
    and report to the SCSI subsystem that we have undergone a reset
    but we are not operational now.

    Signed-off-by: Oliver Neukum <oneukum@suse.com>
    Reported-by: Hans de Goede <hdegoede@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/storage/uas.c | 7 +++----
    1 file changed, 3 insertions(+), 4 deletions(-)

    --- a/drivers/usb/storage/uas.c
    +++ b/drivers/usb/storage/uas.c
    @@ -1076,20 +1076,19 @@ static int uas_post_reset(struct usb_int
    return 0;

    err = uas_configure_endpoints(devinfo);
    - if (err) {
    + if (err && err != ENODEV)
    shost_printk(KERN_ERR, shost,
    "%s: alloc streams error %d after reset",
    __func__, err);
    - return 1;
    - }

    + /* we must unblock the host in every case lest we deadlock */
    spin_lock_irqsave(shost->host_lock, flags);
    scsi_report_bus_reset(shost, 0);
    spin_unlock_irqrestore(shost->host_lock, flags);

    scsi_unblock_requests(shost);

    - return 0;
    + return err ? 1 : 0;
    }

    static int uas_suspend(struct usb_interface *intf, pm_message_t message)

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