From: Dien Pham <dien.pham.ry@xxxxxxxxxxx>
As description for DIV_ROUND_CLOSEST in file include/linux/kernel.h.
"Result is undefined for negative divisors if the dividend variable
type is unsigned and for negative dividends if the divisor variable
type is unsigned."
In current code, the FIXPT_DIV uses DIV_ROUND_CLOSEST but has not
checked sign of divisor before using. It makes undefined temperature
value in case the value is negative.
This patch fixes to satisfy DIV_ROUND_CLOSEST description
and fix bug too. Note that the variable name "reg" is not good
because it should be the same type as rcar_gen3_thermal_read().
However, there is better to rename it in a further patch as
cleanup.
Signed-off-by: Van Do <van.do.xw@xxxxxxxxxxx>
Signed-off-by: Dien Pham <dien.pham.ry@xxxxxxxxxxx>
[shimoda: minor fixes, add Fixes tag]
Fixes: 564e73d283af ("thermal: rcar_gen3_thermal: Add R-Car Gen3 thermal driver")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Reviewed-by: Niklas Soderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Tested-by: Niklas Soderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
Changes from v2:
- Add Niklas-san's Reviewed-by and Tested-by.
- Keep the variable name "reg" and revise the commit description for it.
https://patchwork.kernel.org/patch/11595327/
Changes from v1:
- Use int instead of long.
- Rename "reg" with "ctemp".
https://patchwork.kernel.org/patch/11593051/
drivers/thermal/rcar_gen3_thermal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index 58fe7c1..c48c5e9 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -167,7 +167,7 @@ static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
{
struct rcar_gen3_thermal_tsc *tsc = devdata;
int mcelsius, val;
- u32 reg;
+ int reg;
/* Read register and convert to mili Celsius */
reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
--
2.7.4
