Make sure to drop the reference to the secure monitor device taken by of_find_device_by_node() when looking up its driver data on behalf of other drivers (e.g. during probe).

Note that holding a reference to the platform device does not prevent its driver data from going away so there is no point in keeping the reference after the helper returns.

Fixes: 8cde3c2153e8 ("firmware: meson_sm: Rework driver as a proper platform driver") Cc: stable@vger.kernel.org # 5.5 Cc: Carlo Caione ccaione@baylibre.com Signed-off-by: Johan Hovold johan@kernel.org --- drivers/firmware/meson/meson_sm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c index f25a9746249b..3ab67aaa9e5d 100644 --- a/drivers/firmware/meson/meson_sm.c +++ b/drivers/firmware/meson/meson_sm.c @@ -232,11 +232,16 @@ EXPORT_SYMBOL(meson_sm_call_write); struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node) { struct platform_device *pdev = of_find_device_by_node(sm_node); + struct meson_sm_firmware *fw;

if (!pdev) return NULL;

- return platform_get_drvdata(pdev); + fw = platform_get_drvdata(pdev); + + put_device(&pdev->dev); + + return fw; } EXPORT_SYMBOL_GPL(meson_sm_get);