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soc: amlogic: canvas: Fix meson_canvas_get when probe failed

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When probe fails, a platforn_device is still associated to the node,
but dev_get_drvdata() returns NULL.

Handle this case by returning a consistent error.

Fixes: d4983983d9 ("soc: amlogic: add meson-canvas driver")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Maxime Jourdan <mjourdan@baylibre.com>
[khilman: fixed minor typo in comment ]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Neil Armstrong 2019-02-04 10:49:37 +01:00 committed by Kevin Hilman
parent 99e5a8df8b
commit 382f8be045
1 changed files with 12 additions and 1 deletions
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13
drivers/soc/amlogic/meson-canvas.c
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@ -51,6 +51,7 @@ struct meson_canvas *meson_canvas_get(struct device *dev)
{
struct device_node *canvas_node;
struct platform_device *canvas_pdev;
struct meson_canvas *canvas;
canvas_node = of_parse_phandle(dev->of_node, "amlogic,canvas", 0);
if (!canvas_node)
@ -63,7 +64,17 @@ struct meson_canvas *meson_canvas_get(struct device *dev)
}
of_node_put(canvas_node);
return dev_get_drvdata(&canvas_pdev->dev);
/*
* If priv is NULL, it's probably because the canvas hasn't
* properly initialized. Bail out with -EINVAL because, in the
* current state, this driver probe cannot return -EPROBE_DEFER
*/
canvas = dev_get_drvdata(&canvas_pdev->dev);
if (!canvas)
return ERR_PTR(-EINVAL);
return canvas;
}
EXPORT_SYMBOL_GPL(meson_canvas_get);