thermal/drivers/qcom/lmh: Check for SCM availability at probe

Up until now, the necessary scm availability check has not been
performed, leading to possible null pointer dereferences (which did
happen for me on RB1).

Fix that.

Fixes: 53bca371cdf7 ("thermal/drivers/qcom: Add support for LMh driver")
Cc: <stable@vger.kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20240308-topic-rb1_lmh-v2-2-bac3914b0fe3@linaro.org

diff --git a/drivers/thermal/qcom/lmh.c b/drivers/thermal/qcom/lmh.c
index f6edb12ec00419768354ea55eddb8fa2e711ed4d..5225b3621a56c4a11f0ae56af1060d6d1460ef02 100644 (file)
--- a/drivers/thermal/qcom/lmh.c
+++ b/drivers/thermal/qcom/lmh.c
@@ -95,6 +95,9 @@ static int lmh_probe(struct platform_device *pdev)
        unsigned int enable_alg;
        u32 node_id;
 
+       if (!qcom_scm_is_available())
+               return -EPROBE_DEFER;
+
        lmh_data = devm_kzalloc(dev, sizeof(*lmh_data), GFP_KERNEL);
        if (!lmh_data)
                return -ENOMEM;