hwmon: (pmbus/mp2869) Check pmbus_read_byte_data() before using its return value

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In mp2869_read_byte_data() and mp2869_read_word_data(), the return value
of pmbus_read_byte_data() for PMBUS_STATUS_MFR_SPECIFIC is used directly
inside FIELD_GET() macro arguments without error checking. If the I2C
transaction fails, a negative error code is passed to FIELD_GET() and
FIELD_PREP(), silently corrupting the status register bits being
constructed.

Extract the nested pmbus_read_byte_data() calls into a separate variable
and check for errors before use. This also eliminates a redundant duplicate
read of the same register in the PMBUS_STATUS_TEMPERATURE case.

Fixes: a3a2923aaf ("hwmon: add MP2869,MP29608,MP29612 and MP29816 series driver")
Cc: stable@vger.kernel.org
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Link: https://lore.kernel.org/r/20260317173308.382545-4-sanman.pradhan@hpe.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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This commit is contained in:

Sanman Pradhan 2026-03-17 17:37:41 +00:00 • committed by Guenter Roeck

parent 19d4b9c8a1

commit c6f45ed26b

1 changed files with 21 additions and 14 deletions

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drivers/hwmon/pmbus/mp2869.c

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