regmap: Fix regmap_bulk_write single-rw mutex deadlock
When regmap_bulk_write() is called with the map->use_single_rw flag set
an immediate mutex deadlock happens because regmap_raw_write() is called
after obtaining the mutex and regmap_raw_write() itself then tries to
obtain the mutex as well.
It is obvious that no one other than myself tried it with a real device.
I did, but only for the purposes of an experiment and demonstration.
But even if this situation will never ever happen with a real device, it
is a bug and therefore should be fixed.
Signed-off-by: Anthony Olech <anthony.olech.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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