Staging: iio: meter: ade7759: update locking method for write frequency

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iio_dev->mlock is to be used only by the IIO core for protecting
device mode changes between INDIO_DIRECT and INDIO_BUFFER.

This patch replaces the use of mlock with the already established
buf_lock mutex.

Introducing an 'unlocked' spi_write_reg_16 function to be used by
ade7759_write_frequency avoids nested locks and maintains atomicity
between bus and device frequency changes.

Based on the solution found in ade7754 patch here:
https://marc.info/?l=linux-iio&m=149086659008991&w=2

Signed-off-by: Katie Dunne <kdunne@mail.ccsf.edu>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Katie Dunne 2017-09-18 15:52:40 -07:00 • committed by Jonathan Cameron

parent 08969366af

commit ba272e3bbe

1 changed files with 19 additions and 8 deletions

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drivers/staging/iio/meter/ade7759.c

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