From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
The strict flag in struct pinmux_ops disallows the usage of the same pin
as a GPIO and for another function. Without it, a rouge user-space
process with enough privileges (or even a buggy driver) can request a
used pin as GPIO and drive it, potentially confusing devices or even
crashing the system. Set it globally for all pinctrl-msm users.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
drivers/pinctrl/qcom/pinctrl-msm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index bb1e5aca058fc28c3cc823876c8fe7880d66b6fa..8727b8f394a5a2669c0dc8ffe5f1b83d5db526e8 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -302,6 +302,7 @@ static const struct pinmux_ops msm_pinmux_ops = {
.get_function_groups = msm_get_function_groups,
.gpio_request_enable = msm_pinmux_request_gpio,
.set_mux = msm_pinmux_set_mux,
+ .strict = true,
};
static int msm_config_reg(struct msm_pinctrl *pctrl,
--
2.48.1