linux-kernel - [PATCH v2 mvebu + mvebu/dt64 2/6] firmware: turris-mox-rwtm: report failures better

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Message-Id: <20210429083636.22560-2-pali@kernel.org>
Date:   Thu, 29 Apr 2021 10:36:32 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Marek Behún <kabel@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 mvebu + mvebu/dt64 2/6] firmware: turris-mox-rwtm: report failures better

From: Marek Behún <kabel@...nel.org>

Report a notice level message if a command is not supported by the rWTM
firmware.

This should not be an error, merely a notice, because the firmware can
be used on non-CZ.NIC boards that do not have manufacturing information
burned.

Signed-off-by: Marek Behún <kabel@...nel.org>
Fixes: 389711b37493 ("firmware: Add Turris Mox rWTM firmware driver")
---
 drivers/firmware/turris-mox-rwtm.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/turris-mox-rwtm.c b/drivers/firmware/turris-mox-rwtm.c
index f85acdb3130c..d7e3489e4bf2 100644
--- a/drivers/firmware/turris-mox-rwtm.c
+++ b/drivers/firmware/turris-mox-rwtm.c
@@ -204,11 +204,14 @@ static int mox_get_board_info(struct mox_rwtm *rwtm)
 		return ret;
 
 	ret = mox_get_status(MBOX_CMD_BOARD_INFO, reply->retval);
-	if (ret < 0 && ret != -ENODATA) {
-		return ret;
-	} else if (ret == -ENODATA) {
+	if (ret == -ENODATA) {
 		dev_warn(rwtm->dev,
 			 "Board does not have manufacturing information burned!\n");
+	} else if (ret == -ENOSYS) {
+		dev_notice(rwtm->dev,
+			   "Firmware does not support the BOARD_INFO command\n");
+	} else if (ret < 0) {
+		return ret;
 	} else {
 		rwtm->serial_number = reply->status[1];
 		rwtm->serial_number <<= 32;
@@ -237,10 +240,13 @@ static int mox_get_board_info(struct mox_rwtm *rwtm)
 		return ret;
 
 	ret = mox_get_status(MBOX_CMD_ECDSA_PUB_KEY, reply->retval);
-	if (ret < 0 && ret != -ENODATA) {
-		return ret;
-	} else if (ret == -ENODATA) {
+	if (ret == -ENODATA) {
 		dev_warn(rwtm->dev, "Board has no public key burned!\n");
+	} else if (ret == -ENOSYS) {
+		dev_notice(rwtm->dev,
+			   "Firmware does not support the ECDSA_PUB_KEY command\n");
+	} else if (ret < 0) {
+		return ret;
 	} else {
 		u32 *s = reply->status;
 
-- 
2.20.1