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Subject[PATCH] firmware: arm_scmi: Avoid padding in sensor message structure
Date
Structure scmi_resp_sensor_reading_complete is meant to represent an SCMI
asynchronous reading complete message: representing 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 padding
or the need to make it packed.

Fixes: e2083d3673916 ("firmware: arm_scmi: Add SCMI v3.0 sensors timestamped reads")
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
drivers/firmware/arm_scmi/sensors.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index 2c88aa221559..308471586381 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -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;
}
--
2.17.1
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