5.4-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 8ece3173f87df03935906d0c612c2aeda9db92ca upstream.
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 Acked-by: Martin Blumenstingl martin.blumenstingl@googlemail.com Link: https://lore.kernel.org/r/20250725074019.8765-1-johan@kernel.org Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/meson/meson_sm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/firmware/meson/meson_sm.c +++ b/drivers/firmware/meson/meson_sm.c @@ -223,11 +223,16 @@ 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);