| Message ID | 20240424132408.2565916-3-gnstark@salutedevices.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | meson pwm small fixes | expand |
On Wed, Apr 24, 2024 at 04:24:08PM +0300, George Stark wrote: > clk_round_rate() can return not only zero if requested frequency can not > be provided but also negative error code so add check for it too. > > Also change type of variable holding clk_round_rate() result from > unsigned long to long. It's safe due to clk_round_rate() returns long. > > Fixes: 329db102a26d ("pwm: meson: make full use of common clock framework") > Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com> > Signed-off-by: George Stark <gnstark@salutedevices.com> > --- > drivers/pwm/pwm-meson.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c > index f4d70da621ec..d4228ac1e7ea 100644 > --- a/drivers/pwm/pwm-meson.c > +++ b/drivers/pwm/pwm-meson.c > @@ -148,7 +148,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, > struct meson_pwm *meson = to_meson_pwm(chip); > struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; > unsigned int cnt, duty_cnt; > - unsigned long fin_freq; > + long fin_freq; > u64 duty, period, freq; > > duty = state->duty_cycle; > @@ -168,9 +168,10 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, > freq = ULONG_MAX; > > fin_freq = clk_round_rate(channel->clk, freq); > - if (fin_freq == 0) { > - dev_err(pwmchip_parent(chip), "invalid source clock frequency\n"); > - return -EINVAL; > + if (fin_freq <= 0) { > + dev_err(pwmchip_parent(chip), > + "invalid source clock frequency %llu\n", freq); > + return fin_freq ? fin_freq : -EINVAL; > } > > dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq); ^ With fin_freq now being unsigned, this ------------' should be a 'd'. If you want to still extend your fixes series: A bit further below there is cnt = div_u64(fin_freq * period, NSEC_PER_SEC); . The multiplication there might overflow. This should better use mul_u64_u64_div_u64() (or one of it's variants). Best regards Uwe
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index f4d70da621ec..d4228ac1e7ea 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -148,7 +148,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, struct meson_pwm *meson = to_meson_pwm(chip); struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; unsigned int cnt, duty_cnt; - unsigned long fin_freq; + long fin_freq; u64 duty, period, freq; duty = state->duty_cycle; @@ -168,9 +168,10 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, freq = ULONG_MAX; fin_freq = clk_round_rate(channel->clk, freq); - if (fin_freq == 0) { - dev_err(pwmchip_parent(chip), "invalid source clock frequency\n"); - return -EINVAL; + if (fin_freq <= 0) { + dev_err(pwmchip_parent(chip), + "invalid source clock frequency %llu\n", freq); + return fin_freq ? fin_freq : -EINVAL; } dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq);
clk_round_rate() can return not only zero if requested frequency can not be provided but also negative error code so add check for it too. Also change type of variable holding clk_round_rate() result from unsigned long to long. It's safe due to clk_round_rate() returns long. Fixes: 329db102a26d ("pwm: meson: make full use of common clock framework") Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com> Signed-off-by: George Stark <gnstark@salutedevices.com> --- drivers/pwm/pwm-meson.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)