The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 87a2cbf02d7701255f9fcca7e5bd864a7bb397cf # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023072133-plank-glorified-2d3f@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
87a2cbf02d77 ("pwm: meson: fix handling of period/duty if greater than UINT_MAX") 5f97f18feac9 ("pwm: meson: Simplify duplicated per-channel tracking") 437fb760d046 ("pwm: meson: Remove redundant assignment to variable fin_freq")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 87a2cbf02d7701255f9fcca7e5bd864a7bb397cf Mon Sep 17 00:00:00 2001 From: Heiner Kallweit hkallweit1@gmail.com Date: Wed, 24 May 2023 21:48:36 +0200 Subject: [PATCH] pwm: meson: fix handling of period/duty if greater than UINT_MAX MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
state->period/duty are of type u64, and if their value is greater than UINT_MAX, then the cast to uint will cause problems. Fix this by changing the type of the respective local variables to u64.
Fixes: b79c3670e120 ("pwm: meson: Don't duplicate the polarity internally") Cc: stable@vger.kernel.org Suggested-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Reviewed-by: Martin Blumenstingl martin.blumenstingl@googlemail.com Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Signed-off-by: Thierry Reding thierry.reding@gmail.com
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 3865538dd2d6..33107204a951 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -156,8 +156,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, const struct pwm_state *state) { struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; - unsigned int duty, period, pre_div, cnt, duty_cnt; + unsigned int pre_div, cnt, duty_cnt; unsigned long fin_freq; + u64 duty, period;
duty = state->duty_cycle; period = state->period; @@ -179,19 +180,19 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
- pre_div = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * 0xffffLL); + pre_div = div64_u64(fin_freq * period, NSEC_PER_SEC * 0xffffLL); if (pre_div > MISC_CLK_DIV_MASK) { dev_err(meson->chip.dev, "unable to get period pre_div\n"); return -EINVAL; }
- cnt = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * (pre_div + 1)); + cnt = div64_u64(fin_freq * period, NSEC_PER_SEC * (pre_div + 1)); if (cnt > 0xffff) { dev_err(meson->chip.dev, "unable to get period cnt\n"); return -EINVAL; }
- dev_dbg(meson->chip.dev, "period=%u pre_div=%u cnt=%u\n", period, + dev_dbg(meson->chip.dev, "period=%llu pre_div=%u cnt=%u\n", period, pre_div, cnt);
if (duty == period) { @@ -204,14 +205,13 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, channel->lo = cnt; } else { /* Then check is we can have the duty with the same pre_div */ - duty_cnt = div64_u64(fin_freq * (u64)duty, - NSEC_PER_SEC * (pre_div + 1)); + duty_cnt = div64_u64(fin_freq * duty, NSEC_PER_SEC * (pre_div + 1)); if (duty_cnt > 0xffff) { dev_err(meson->chip.dev, "unable to get duty cycle\n"); return -EINVAL; }
- dev_dbg(meson->chip.dev, "duty=%u pre_div=%u duty_cnt=%u\n", + dev_dbg(meson->chip.dev, "duty=%llu pre_div=%u duty_cnt=%u\n", duty, pre_div, duty_cnt);
channel->pre_div = pre_div;