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/openbmc/linux/drivers/hwmon/ |
H A D | ina3221.c | 87625b24 Mon Nov 05 14:48:41 CST 2018 Nicolin Chen <nicoleotsuka@gmail.com> hwmon: (ina3221) Serialize sysfs ABI accesses
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> 87625b24 Mon Nov 05 14:48:41 CST 2018 Nicolin Chen <nicoleotsuka@gmail.com> hwmon: (ina3221) Serialize sysfs ABI accesses 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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