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: 53bca37 ("thermal/drivers/qcom: Add support for LMh driver")
Cc: <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Signed-off-by: Konrad Dybcio <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: konradybcio

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;