linux-kernel - [PATCH v4 16/21] platform/chrome: cros_ec_proto: check `msg->result` in getting cmd mask

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Message-Id: <20220609084957.3684698-17-tzungbi@kernel.org>
Date:   Thu,  9 Jun 2022 08:49:52 +0000
From:   Tzung-Bi Shih <tzungbi@...nel.org>
To:     bleung@...omium.org, groeck@...omium.org
Cc:     chrome-platform@...ts.linux.dev, tzungbi@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 16/21] platform/chrome: cros_ec_proto: check `msg->result` in getting cmd mask

cros_ec_get_host_command_version_mask() should check if EC wasn't happy
by checking `msg->result`.

Use cros_ec_map_error() and return the error code if any.

Reviewed-by: Guenter Roeck <groeck@...omium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
---
Changes from v3:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 20a1f8f7e70d..ac445bbbd060 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -428,13 +428,12 @@ static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
  * the caller has ec_dev->lock mutex or the caller knows there is
  * no other command in progress.
  */
-static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
-	u16 cmd, u32 *mask)
+static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, u16 cmd, u32 *mask)
 {
 	struct ec_params_get_cmd_versions *pver;
 	struct ec_response_get_cmd_versions *rver;
 	struct cros_ec_command *msg;
-	int ret;
+	int ret, mapped;
 
 	msg = kmalloc(sizeof(*msg) + max(sizeof(*rver), sizeof(*pver)),
 		      GFP_KERNEL);
@@ -450,14 +449,20 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
 	pver->cmd = cmd;
 
 	ret = send_command(ec_dev, msg);
-	if (ret > 0) {
-		rver = (struct ec_response_get_cmd_versions *)msg->data;
-		*mask = rver->version_mask;
-		ret = 0;
+	if (ret < 0)
+		goto exit;
+
+	mapped = cros_ec_map_error(msg->result);
+	if (mapped) {
+		ret = mapped;
+		goto exit;
 	}
 
+	rver = (struct ec_response_get_cmd_versions *)msg->data;
+	*mask = rver->version_mask;
+	ret = 0;
+exit:
 	kfree(msg);
-
 	return ret;
 }
 
-- 
2.36.1.255.ge46751e96f-goog