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    Subject[PATCH 5.15 328/917] drm/bridge: it66121: Wait for next bridge to be probed
    Date
    From: Paul Cercueil <paul@crapouillou.net>

    [ Upstream commit 8b03e3fc79189b17d31a82f5e175698802a11e87 ]

    If run before the next bridge is initialized, of_drm_find_bridge() will
    give us a NULL pointer.

    If that's the case, return -EPROBE_DEFER; we may have more luck next
    time.

    Signed-off-by: Paul Cercueil <paul@crapouillou.net>
    Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver")
    Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
    Signed-off-by: Robert Foss <robert.foss@linaro.org>
    Link: https://patchwork.freedesktop.org/patch/msgid/20210827163956.27517-2-paul@crapouillou.net
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/bridge/ite-it66121.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
    index b130d01147c6c..9dc41a7b91362 100644
    --- a/drivers/gpu/drm/bridge/ite-it66121.c
    +++ b/drivers/gpu/drm/bridge/ite-it66121.c
    @@ -924,6 +924,9 @@ static int it66121_probe(struct i2c_client *client,
    ctx->next_bridge = of_drm_find_bridge(ep);
    of_node_put(ep);

    + if (!ctx->next_bridge)
    + return -EPROBE_DEFER;
    +
    i2c_set_clientdata(client, ctx);
    mutex_init(&ctx->lock);

    --
    2.33.0


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