linux-kernel - [PATCH 5.10 229/243] firmware: turris-mox-rwtm: fix reply status decoding function

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Date:   Mon, 19 Jul 2021 16:54:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Behún <kabel@...nel.org>,
        Pali Rohár <pali@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 229/243] firmware: turris-mox-rwtm: fix reply status decoding function

From: Marek Behún <kabel@...nel.org>

[ Upstream commit e34e60253d9272311831daed8a2d967cf80ca3dc ]

The status decoding function mox_get_status() currently contains an
incorrect check: if the error status is not MBOX_STS_SUCCESS, it always
returns -EIO, so the comparison to MBOX_STS_FAIL is never executed and
we don't get the actual error code sent by the firmware.

Fix this.

Signed-off-by: Marek Behún <kabel@...nel.org>
Reviewed-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Fixes: 389711b37493 ("firmware: Add Turris Mox rWTM firmware driver")
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/turris-mox-rwtm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/turris-mox-rwtm.c b/drivers/firmware/turris-mox-rwtm.c
index 50bb2a6d6ccf..54b98642ee1b 100644
--- a/drivers/firmware/turris-mox-rwtm.c
+++ b/drivers/firmware/turris-mox-rwtm.c
@@ -147,11 +147,14 @@ MOX_ATTR_RO(pubkey, "%s\n", pubkey);
 
 static int mox_get_status(enum mbox_cmd cmd, u32 retval)
 {
-	if (MBOX_STS_CMD(retval) != cmd ||
-	    MBOX_STS_ERROR(retval) != MBOX_STS_SUCCESS)
+	if (MBOX_STS_CMD(retval) != cmd)
 		return -EIO;
 	else if (MBOX_STS_ERROR(retval) == MBOX_STS_FAIL)
 		return -(int)MBOX_STS_VALUE(retval);
+	else if (MBOX_STS_ERROR(retval) == MBOX_STS_BADCMD)
+		return -ENOSYS;
+	else if (MBOX_STS_ERROR(retval) != MBOX_STS_SUCCESS)
+		return -EIO;
 	else
 		return MBOX_STS_VALUE(retval);
 }
-- 
2.30.2