There is a coverity issue in the original mtk_disp_pwm_get_state()
function. In function call DIV64_U64_ROUND_UP, division by expression
Which may be zero has undefined behavior.
Fix this accordingly.
Signed-off-by: Shuijing Li <shuijing.li@xxxxxxxxxxxx>
---
drivers/pwm/pwm-mtk-disp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index 79e321e96f56..ca00058a6ef4 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -196,6 +196,14 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
return err;
}
+ rate = clk_get_rate(mdp->clk_main);
+ if (rate <= 0) {
+ dev_err(chip->dev, "Can't get rate: %pe\n", ERR_PTR(rate));
+ clk_disable_unprepare(mdp->clk_mm);
+ clk_disable_unprepare(mdp->clk_main);
+ return err;
+ }
+
/*
* Apply DISP_PWM_DEBUG settings to choose whether to enable or disable
* registers double buffer and manual commit to working register before
@@ -206,7 +214,6 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
mdp->data->bls_debug_mask,
mdp->data->bls_debug_mask);
- rate = clk_get_rate(mdp->clk_main);
con0 = readl(mdp->base + mdp->data->con0);
con1 = readl(mdp->base + mdp->data->con1);
pwm_en = readl(mdp->base + DISP_PWM_EN);
--
2.40.1
