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firmware: arm_scmi: Avoid padding in sensor message structure

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scmi_resp_sensor_reading_complete structure is meant to represent an
SCMI asynchronous reading complete message. The readings field with
a 64bit type forces padding and breaks reads in scmi_sensor_reading_get.

Split it in two adjacent 32bit readings_low/high subfields to avoid the
padding within the structure. Alternatively we could to mark the structure
packed.

Link: https://lore.kernel.org/r/20210628170042.34105-1-cristian.marussi@arm.com
Fixes: e2083d3673 ("firmware: arm_scmi: Add SCMI v3.0 sensors timestamped reads")
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2021-06-28 18:00:42 +01:00 committed by Sudeep Holla
parent b98cf55ec0
commit 187a002b07
1 changed files with 4 additions and 2 deletions
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6
drivers/firmware/arm_scmi/sensors.c
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@ -166,7 +166,8 @@ struct scmi_msg_sensor_reading_get {
struct scmi_resp_sensor_reading_complete {
__le32 id;
__le64 readings;
__le32 readings_low;
__le32 readings_high;
};
struct scmi_sensor_reading_resp {
@ -717,7 +718,8 @@ static int scmi_sensor_reading_get(const struct scmi_protocol_handle *ph,
resp = t->rx.buf;
if (le32_to_cpu(resp->id) == sensor_id)
*value = get_unaligned_le64(&resp->readings);
*value =
get_unaligned_le64(&resp->readings_low);
else
ret = -EPROTO;
}