diff options
Diffstat (limited to 'drivers/pwm/core.c')
| -rw-r--r-- | drivers/pwm/core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 403525cc1783..d3f475eca97f 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -481,6 +481,7 @@ struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, size_t chip->dev = parent; chip->npwm = npwm; + chip->uses_pwmchip_alloc = true; pwmchip_set_drvdata(chip, pwmchip_priv(chip)); @@ -561,6 +562,15 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner) if (!chip || !pwmchip_parent(chip) || !chip->ops || !chip->npwm) return -EINVAL; + /* + * a struct pwm_chip must be allocated using (devm_)pwmchip_alloc, + * otherwise the embedded struct device might disappear too early + * resulting in memory corruption. + * Catch drivers that were not converted appropriately. + */ + if (!chip->uses_pwmchip_alloc) + return -EINVAL; + if (!pwm_ops_check(chip)) return -EINVAL; |