linux-kernel - [PATCH v2 1/2] fsi: occ: Fix checksum failure mode

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Message-Id: <20220426154956.27205-2-eajames@linux.ibm.com>
Date:   Tue, 26 Apr 2022 10:49:55 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-fsi@...ts.ozlabs.org
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        jdelvare@...e.com, linux@...ck-us.net, joel@....id.au,
        jk@...abs.org, David.Laight@...LAB.COM
Subject: [PATCH v2 1/2] fsi: occ: Fix checksum failure mode

Change the checksum errno to something different than the errno
used for a bad SBE message. In addition, don't set the user's
response length to the data length in this case, since it's not
SBE FFDC.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/fsi/fsi-occ.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
index c9cc75fbdfb9..3d04e8baecbb 100644
--- a/drivers/fsi/fsi-occ.c
+++ b/drivers/fsi/fsi-occ.c
@@ -246,7 +246,7 @@ static int occ_verify_checksum(struct occ *occ, struct occ_response *resp,
 	if (checksum != checksum_resp) {
 		dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum,
 			checksum_resp);
-		return -EBADMSG;
+		return -EBADE;
 	}
 
 	return 0;
@@ -575,8 +575,11 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
 	dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n",
 		resp->return_status, resp_data_length);
 
-	occ->client_response_size = resp_data_length + 7;
 	rc = occ_verify_checksum(occ, resp, resp_data_length);
+	if (rc)
+		goto done;
+
+	occ->client_response_size = resp_data_length + 7;
 
  done:
 	*resp_len = occ->client_response_size;
-- 
2.27.0