linux-kernel - [PATCH v6 01/17] firmware: arm_scmi: Avoid padding in sensor message structure

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Date:   Mon, 12 Jul 2021 15:18:17 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, cristian.marussi@....com,
        igor.skalkin@...nsynergy.com, peter.hilber@...nsynergy.com,
        alex.bennee@...aro.org, jean-philippe@...aro.org,
        mikhail.golubev@...nsynergy.com, anton.yakovlev@...nsynergy.com,
        Vasyl.Vavrychuk@...nsynergy.com,
        Andriy.Tryshnivskyy@...nsynergy.com
Subject: [PATCH v6 01/17] firmware: arm_scmi: Avoid padding in sensor message structure

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@....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