Hi,
static analysis with cppcheck has detected an issue in function
nvkm_fan_update() in drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c as
follows:
/* schedule next fan update, if not at target speed already */
if (target != duty) {
u16 bump_period = fan->bios.bump_period;
u16 slow_down_period = fan->bios.slow_down_period;
u64 delay;
if (duty > target)
delay = slow_down_period;
else if (duty == target)
delay = min(bump_period, slow_down_period) ;
else
delay = bump_period;
nvkm_timer_alarm(tmr, delay * 1000 * 1000, &fan->alarm);
}
Checking drivers/gpu/drm/nouveau/nvkm/subdev/therm/gm107.c ...
drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c:93:17: warning: Opposite
inner 'if' condition leads to a dead code block.
[oppositeInnerCondition]
else if (duty == target)
^
The first if statement checks if target != duty, however inside the code
block there is a check if duty == target which can never be true. Either
the logic is wrong, or the duty == target can be safely removed.
Colin