tree c05e3c03fa6a7aebaf8c031d8067230c966628ce
parent 593f585ffad95dd065b188f49336835a5a461488
author Samu Nuutamo <samu.nuutamo@vincit.fi> 1589194939 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1589955429 +0200

hwmon: (da9052) Synchronize access with mfd

[ Upstream commit 333e22db228f0bd0c839553015a6a8d3db4ba569 ]

When tsi-as-adc is configured it is possible for in7[0123]_input read to
return an incorrect value if a concurrent read to in[456]_input is
performed. This is caused by a concurrent manipulation of the mux
channel without proper locking as hwmon and mfd use different locks for
synchronization.

Switch hwmon to use the same lock as mfd when accessing the TSI channel.

Fixes: 4f16cab19a3d5 ("hwmon: da9052: Add support for TSI channel")
Signed-off-by: Samu Nuutamo <samu.nuutamo@vincit.fi>
[rebase to current master, reword commit message slightly]
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>