block: Make WBT latency writes honor enable state#979
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queue/wbt_lat_usec controls both the stored WBT latency target and the effective WBT enable state. The old no-op check skipped updates whenever the converted latency matched the stored min_lat_nsec. That check ignored whether the current WBT state already matched the state requested by the write. For a queue disabled by default, attempting to enable WBT by writing the default value through sysfs could return success while the enable state was left unchanged. Treat a write as a no-op only when both the stored latency and the effective WBT enabled state already match the converted value. Signed-off-by: Guzebing <guzebing1612@gmail.com>
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Pull request for series with
subject: block: Make WBT latency writes honor enable state
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1114268