[PATCH] thermal: spacemit: validate clamped trip thresholds

[kr494167@gmail.com]

From: surendra <kr494167@gmail.com>

k1_tsensor_set_trips() checks the requested trip temperatures before
converting them to the sensor register representation. Distinct
out-of-range temperatures can clamp to the same hardware value, leaving the
sensor with an invalid low/high threshold pair.

Validate the ordering after conversion and clamping.

Fixes: 296a977f2bac ("thermal/drivers/spacemit/k1: Add thermal sensor support")
Signed-off-by: surendra <kr494167@gmail.com>
---
 drivers/thermal/spacemit/k1_tsensor.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/spacemit/k1_tsensor.c b/drivers/thermal/spacemit/k1_tsensor.c
index 79222d233129..a9eaedefdac3 100644
--- a/drivers/thermal/spacemit/k1_tsensor.c
+++ b/drivers/thermal/spacemit/k1_tsensor.c
@@ -156,13 +156,12 @@ static int k1_tsensor_set_trips(struct thermal_zone_device *tz, int low, int hig
 	struct k1_tsensor *ts = ch->ts;
 	u32 val;
 
-	if (low >= high)
-		return -EINVAL;
-
 	low = clamp_val(low / 1000 + TEMPERATURE_OFFSET, TEMPERATURE_OFFSET,
 			FIELD_MAX(K1_TSENSOR_THRSH_LOW_MASK));
 	high = clamp_val(high / 1000 + TEMPERATURE_OFFSET, TEMPERATURE_OFFSET,
 			 FIELD_MAX(K1_TSENSOR_THRSH_HIGH_MASK));
+	if (low >= high)
+		return -EINVAL;
 
 	val = readl(ts->base + K1_TSENSOR_THRSH_REG(ch->id));
 
-- 
2.55.0