[PATCH 1/7] PWM: core: check that struct pwm_chip::devname is set

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There's no equivalent to devname in the Linux API, but it's required for
barebox and not populating the pointer in struct pwm_chip will lead to a
crash inside pwmchip_add. Check that the pointer is non-NULL to catch
this case.

Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
 drivers/pwm/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index a3f27708e6ef..976357e6062f 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -97,6 +97,9 @@ int pwmchip_add(struct pwm_chip *chip, struct device *dev)
 	struct param_d *p;
 	int ret;
+	if (!chip->devname)
+		return -EINVAL;
 	if (_find_pwm(chip->devname))
 		return -EBUSY;

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