linux-kernel - [PATCH 1/4] block/sed: Use ssize_t on atom parsers to return errors

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Message-Id: <1487187535-10503-1-git-send-email-jonathan.derrick@intel.com>
Date:   Wed, 15 Feb 2017 12:38:51 -0700
From:   Jon Derrick <jonathan.derrick@...el.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Jon Derrick <jonathan.derrick@...el.com>,
        Scott Bauer <scott.bauer@...el.com>,
        Rafael Antognolli <rafael.antognolli@...el.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] block/sed: Use ssize_t on atom parsers to return errors

The short atom parser can return an errno from decoding but does not
currently return the error as a signed value. Convert all of the parsers
to ssize_t.

Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
---
 block/sed-opal.c         | 28 ++++++++++++++--------------
 include/linux/sed-opal.h |  2 +-
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e95b8a5..77623ad 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -635,8 +635,8 @@ static enum opal_token response_get_token(const struct parsed_resp *resp,
 	return tok->pos[0];
 }
 
-static size_t response_parse_tiny(struct opal_resp_tok *tok,
-				  const u8 *pos)
+static ssize_t response_parse_tiny(struct opal_resp_tok *tok,
+				   const u8 *pos)
 {
 	tok->pos = pos;
 	tok->len = 1;
@@ -652,8 +652,8 @@ static size_t response_parse_tiny(struct opal_resp_tok *tok,
 	return tok->len;
 }
 
-static size_t response_parse_short(struct opal_resp_tok *tok,
-				   const u8 *pos)
+static ssize_t response_parse_short(struct opal_resp_tok *tok,
+				    const u8 *pos)
 {
 	tok->pos = pos;
 	tok->len = (pos[0] & SHORT_ATOM_LEN_MASK) + 1;
@@ -665,7 +665,7 @@ static size_t response_parse_short(struct opal_resp_tok *tok,
 		tok->type = OPAL_DTA_TOKENID_SINT;
 	} else {
 		u64 u_integer = 0;
-		int i, b = 0;
+		ssize_t i, b = 0;
 
 		tok->type = OPAL_DTA_TOKENID_UINT;
 		if (tok->len > 9) {
@@ -682,8 +682,8 @@ static size_t response_parse_short(struct opal_resp_tok *tok,
 	return tok->len;
 }
 
-static size_t response_parse_medium(struct opal_resp_tok *tok,
-				    const u8 *pos)
+static ssize_t response_parse_medium(struct opal_resp_tok *tok,
+				     const u8 *pos)
 {
 	tok->pos = pos;
 	tok->len = (((pos[0] & MEDIUM_ATOM_LEN_MASK) << 8) | pos[1]) + 2;
@@ -699,8 +699,8 @@ static size_t response_parse_medium(struct opal_resp_tok *tok,
 	return tok->len;
 }
 
-static size_t response_parse_long(struct opal_resp_tok *tok,
-				  const u8 *pos)
+static ssize_t response_parse_long(struct opal_resp_tok *tok,
+				   const u8 *pos)
 {
 	tok->pos = pos;
 	tok->len = ((pos[1] << 16) | (pos[2] << 8) | pos[3]) + 4;
@@ -716,8 +716,8 @@ static size_t response_parse_long(struct opal_resp_tok *tok,
 	return tok->len;
 }
 
-static size_t response_parse_token(struct opal_resp_tok *tok,
-				   const u8 *pos)
+static ssize_t response_parse_token(struct opal_resp_tok *tok,
+				    const u8 *pos)
 {
 	tok->pos = pos;
 	tok->len = 1;
@@ -734,7 +734,7 @@ static int response_parse(const u8 *buf, size_t length,
 	struct opal_resp_tok *iter;
 	int num_entries = 0;
 	int total;
-	size_t token_length;
+	ssize_t token_length;
 	const u8 *pos;
 
 	if (!buf)
@@ -780,8 +780,8 @@ static int response_parse(const u8 *buf, size_t length,
 		else /* TOKEN */
 			token_length = response_parse_token(iter, pos);
 
-		if (token_length == -EINVAL)
-			return -EINVAL;
+		if (token_length < 0)
+			return token_length;
 
 		pos += token_length;
 		total -= token_length;
diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
index 205d520..4fc72d4 100644
--- a/include/linux/sed-opal.h
+++ b/include/linux/sed-opal.h
@@ -69,7 +69,7 @@ enum opal_response_token {
  */
 struct opal_resp_tok {
 	const u8 *pos;
-	size_t len;
+	ssize_t len;
 	enum opal_response_token type;
 	enum opal_atom_width width;
 	union {
-- 
1.8.3.1