pwm: Fix pwm_apply_args() call sites
pwm_apply_args() is supposed to initialize a PWM device according to the
arguments provided by the DT or the PWM lookup, but this function was
called inside pwm_device_request(), which in turn was called before the
core had a chance to initialize the pwm->args fields.
Fix that by calling pwm_apply_args directly in pwm_get() and of_pwm_get()
after initializing pwm->args field.
This commit also fixes an invalid pointer dereference introduced by
commit e39c0df1be5a ("pwm: Introduce the pwm_args concept").
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: e39c0df1be5a ("pwm: Introduce the pwm_args concept")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 680fbc7..22cf395 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -128,13 +128,6 @@
set_bit(PWMF_REQUESTED, &pwm->flags);
pwm->label = label;
- /*
- * FIXME: This should be removed once all PWM users properly make use
- * of struct pwm_args to initialize the PWM device. As long as this is
- * here, the PWM state and hardware state can get out of sync.
- */
- pwm_apply_args(pwm);
-
return 0;
}
@@ -627,6 +620,13 @@
pwm->label = con_id;
+ /*
+ * FIXME: This should be removed once all PWM users properly make use
+ * of struct pwm_args to initialize the PWM device. As long as this is
+ * here, the PWM state and hardware state can get out of sync.
+ */
+ pwm_apply_args(pwm);
+
put:
of_node_put(args.np);
@@ -754,13 +754,20 @@
if (!chip)
goto out;
- pwm->args.period = chosen->period;
- pwm->args.polarity = chosen->polarity;
-
pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
if (IS_ERR(pwm))
goto out;
+ pwm->args.period = chosen->period;
+ pwm->args.polarity = chosen->polarity;
+
+ /*
+ * FIXME: This should be removed once all PWM users properly make use
+ * of struct pwm_args to initialize the PWM device. As long as this is
+ * here, the PWM state and hardware state can get out of sync.
+ */
+ pwm_apply_args(pwm);
+
out:
mutex_unlock(&pwm_lookup_lock);
return pwm;