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authorEddie James <eajames@linux.ibm.com>2021-02-09 18:12:33 +0100
committerJoel Stanley <joel@jms.id.au>2021-06-04 06:59:57 +0200
commit614f0a50c9df6e56e555b66f2bdd0495d4c4aef1 (patch)
treedff47ba1c8ca9f508bb77bd798cbc841ae143915 /drivers/fsi/fsi-occ.c
parentfsi: occ: Don't accept response from un-initialized OCC (diff)
downloadlinux-614f0a50c9df6e56e555b66f2bdd0495d4c4aef1.tar.xz
linux-614f0a50c9df6e56e555b66f2bdd0495d4c4aef1.zip
fsi: occ: Log error for checksum failure
Log an error if the response checksum doesn't match the calculated checksum. Signed-off-by: Eddie James <eajames@linux.ibm.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20210209171235.20624-3-eajames@linux.ibm.com Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi/fsi-occ.c')
-rw-r--r--drivers/fsi/fsi-occ.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
index dc74bffedd72..b223f0ef337b 100644
--- a/drivers/fsi/fsi-occ.c
+++ b/drivers/fsi/fsi-occ.c
@@ -223,7 +223,8 @@ static const struct file_operations occ_fops = {
.release = occ_release,
};
-static int occ_verify_checksum(struct occ_response *resp, u16 data_length)
+static int occ_verify_checksum(struct occ *occ, struct occ_response *resp,
+ u16 data_length)
{
/* Fetch the two bytes after the data for the checksum. */
u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]);
@@ -238,8 +239,11 @@ static int occ_verify_checksum(struct occ_response *resp, u16 data_length)
for (i = 0; i < data_length; ++i)
checksum += resp->data[i];
- if (checksum != checksum_resp)
+ if (checksum != checksum_resp) {
+ dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum,
+ checksum_resp);
return -EBADMSG;
+ }
return 0;
}
@@ -533,7 +537,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
}
*resp_len = resp_data_length + 7;
- rc = occ_verify_checksum(resp, resp_data_length);
+ rc = occ_verify_checksum(occ, resp, resp_data_length);
done:
mutex_unlock(&occ->occ_lock);