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| author | Ingo Molnar <[email protected]> | 2020-11-27 10:09:57 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2020-11-27 10:10:50 +0000 |
| commit | a787bdaff83a085288b6fc607afb4bb648da3cc9 (patch) | |
| tree | ec389c1494ef4790ea90f65c4f86e523caf325d0 /drivers/hwmon/pwm-fan.c | |
| parent | irq_work: Optimize irq_work_single() (diff) | |
| parent | Merge tag 'pm-5.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafa... (diff) | |
| download | kernel-a787bdaff83a085288b6fc607afb4bb648da3cc9.tar.gz kernel-a787bdaff83a085288b6fc607afb4bb648da3cc9.zip | |
Merge branch 'linus' into sched/core, to resolve semantic conflict
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'drivers/hwmon/pwm-fan.c')
| -rw-r--r-- | drivers/hwmon/pwm-fan.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index bdba2143021a..1f63807c0399 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -54,16 +54,18 @@ static irqreturn_t pulse_handler(int irq, void *dev_id) static void sample_timer(struct timer_list *t) { struct pwm_fan_ctx *ctx = from_timer(ctx, t, rpm_timer); + unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start); int pulses; - u64 tmp; - pulses = atomic_read(&ctx->pulses); - atomic_sub(pulses, &ctx->pulses); - tmp = (u64)pulses * ktime_ms_delta(ktime_get(), ctx->sample_start) * 60; - do_div(tmp, ctx->pulses_per_revolution * 1000); - ctx->rpm = tmp; + if (delta) { + pulses = atomic_read(&ctx->pulses); + atomic_sub(pulses, &ctx->pulses); + ctx->rpm = (unsigned int)(pulses * 1000 * 60) / + (ctx->pulses_per_revolution * delta); + + ctx->sample_start = ktime_get(); + } - ctx->sample_start = ktime_get(); mod_timer(&ctx->rpm_timer, jiffies + HZ); } |