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authorFabrice Gasnier <fabrice.gasnier@st.com>2018-02-14 11:04:33 +0100
committerThierry Reding <thierry.reding@gmail.com>2018-03-28 00:37:37 +0200
commit4eb67a209645a87b8aca070aa9735eed90177829 (patch)
tree4ad3d7082201ff0399725c80c99304f9620289d6
parent3af0bdd1d027292d40c7f1d13420bc298b3e1660 (diff)
pwm: stm32: Protect common prescaler for all channels
There may be a race, when configuring two PWM channels, with different prescaler values, when there's no active channel yet. Add mutex lock to avoid concurrent access on PWM apply state. This is also precursor patch for PWM capture support. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
-rw-r--r--drivers/pwm/pwm-stm32.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 014e2a759fa6..2708212933f7 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -20,6 +20,7 @@
struct stm32_pwm {
struct pwm_chip chip;
+ struct mutex lock; /* protect pwm config/enable */
struct clk *clk;
struct regmap *regmap;
u32 max_arr;
@@ -212,9 +213,23 @@ static int stm32_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
return ret;
}
+static int stm32_pwm_apply_locked(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state)
+{
+ struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
+ int ret;
+
+ /* protect common prescaler for all active channels */
+ mutex_lock(&priv->lock);
+ ret = stm32_pwm_apply(chip, pwm, state);
+ mutex_unlock(&priv->lock);
+
+ return ret;
+}
+
static const struct pwm_ops stm32pwm_ops = {
.owner = THIS_MODULE,
- .apply = stm32_pwm_apply,
+ .apply = stm32_pwm_apply_locked,
};
static int stm32_pwm_set_breakinput(struct stm32_pwm *priv,
@@ -334,6 +349,7 @@ static int stm32_pwm_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
+ mutex_init(&priv->lock);
priv->regmap = ddata->regmap;
priv->clk = ddata->clk;
priv->max_arr = ddata->max_arr;