hwmon: (ina3221) Serialize sysfs ABI accesses

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This change adds a mutex to serialize accesses of sysfs attributes.

This is required when polling CVRF bit of the MASK/ENABLE register
because this bit is cleared on a read of this MASK/ENABLE register
or a write to CONFIG register, which means that this bit might be
accidentally cleared by reading other fields like alert flags.

So this patch adds a mutex lock to protect the write() and read()
callbacks. The read_string() callback won't need the lock since it
just returns the label without touching any hardware register.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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Nicolin Chen 2018-11-05 12:48:41 -08:00 • committed by Guenter Roeck

parent efb0489ea8

commit 87625b2498

1 changed files with 45 additions and 6 deletions

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drivers/hwmon/ina3221.c

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