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    Subject[PATCH 4.9 48/83] drm/vmwgfx: Dont send drm sysfs hotplug events on initial master set
    Date
    From: Thomas Hellstrom <thellstrom@vmware.com>

    commit 63cb44441826e842b7285575b96db631cc9f2505 upstream.

    This may confuse user-space clients like plymouth that opens a drm
    file descriptor as a result of a hotplug event and then generates a
    new event...

    Cc: <stable@vger.kernel.org>
    Fixes: 5ea1734827bb ("drm/vmwgfx: Send a hotplug event at master_set")
    Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
    Reviewed-by: Deepak Rawat <drawat@vmware.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
    +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
    @@ -1245,7 +1245,13 @@ static int vmw_master_set(struct drm_dev
    }

    dev_priv->active_master = vmaster;
    - drm_sysfs_hotplug_event(dev);
    +
    + /*
    + * Inform a new master that the layout may have changed while
    + * it was gone.
    + */
    + if (!from_open)
    + drm_sysfs_hotplug_event(dev);

    return 0;
    }

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