[PATCHv2 0/5] OPAL patche'd cont'd

[PATCHv2 0/5] OPAL patche'd cont'd

[Jon Derrick]

v1->v2:
Moved misplaced code from 5/5 to 4/5

The first three in the series have been reviewed already but I wanted to
squash them with the next two since they haven't been pulled yet.

The latter 2 are an attempt to refactor some of the awkward func data
and state separation into a common struct

Jon Derrick (5):
  block/sed: Use ssize_t on atom parsers to return errors
  block/sed: Add helper to qualify response tokens
  block/sed: Check received header lengths
  block/sed: Embed function data into the function sequence
  block/sed: Eliminate state variable

 block/sed-opal.c | 494 +++++++++++++++++++++++--------------------------------
 1 file changed, 202 insertions(+), 292 deletions(-)

-- 
1.8.3.1

[PATCHv2 1/5] block/sed: Use ssize_t on atom parsers to return errors

[Jon Derrick]

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@intel.com>
---
 block/sed-opal.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index d1c52ba..4675fd8 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -706,8 +706,8 @@ 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;
@@ -723,8 +723,8 @@ 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;
@@ -736,7 +736,7 @@ 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) {
@@ -753,8 +753,8 @@ 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;
@@ -770,8 +770,8 @@ 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;
@@ -787,8 +787,8 @@ 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;
@@ -805,7 +805,7 @@ 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)
@@ -851,8 +851,8 @@ 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;
-- 
1.8.3.1

[PATCHv2 2/5] block/sed: Add helper to qualify response tokens

[Jon Derrick]

Add helper which verifies the response token is valid and matches the
expected value. Merges token_type and response_get_token.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 block/sed-opal.c | 61 +++++++++++++++++++++++---------------------------------
 1 file changed, 25 insertions(+), 36 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 4675fd8..d3d6db2 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -662,48 +662,25 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
 	return 0;
 }
 
-static enum opal_response_token token_type(const struct parsed_resp *resp,
-					   int n)
+static const struct opal_resp_tok *response_get_token(
+				const struct parsed_resp *resp,
+				int n)
 {
 	const struct opal_resp_tok *tok;
 
 	if (n >= resp->num) {
 		pr_err("Token number doesn't exist: %d, resp: %d\n",
 		       n, resp->num);
-		return OPAL_DTA_TOKENID_INVALID;
+		return ERR_PTR(-EINVAL);
 	}
 
 	tok = &resp->toks[n];
 	if (tok->len == 0) {
 		pr_err("Token length must be non-zero\n");
-		return OPAL_DTA_TOKENID_INVALID;
+		return ERR_PTR(-EINVAL);
 	}
 
-	return tok->type;
-}
-
-/*
- * This function returns 0 in case of invalid token. One should call
- * token_type() first to find out if the token is valid or not.
- */
-static enum opal_token response_get_token(const struct parsed_resp *resp,
-					  int n)
-{
-	const struct opal_resp_tok *tok;
-
-	if (n >= resp->num) {
-		pr_err("Token number doesn't exist: %d, resp: %d\n",
-		       n, resp->num);
-		return 0;
-	}
-
-	tok = &resp->toks[n];
-	if (tok->len == 0) {
-		pr_err("Token length must be non-zero\n");
-		return 0;
-	}
-
-	return tok->pos[0];
+	return tok;
 }
 
 static ssize_t response_parse_tiny(struct opal_resp_tok *tok,
@@ -922,20 +899,32 @@ static u64 response_get_u64(const struct parsed_resp *resp, int n)
 	return resp->toks[n].stored.u;
 }
 
+static bool response_token_matches(const struct opal_resp_tok *token, u8 match)
+{
+	if (IS_ERR(token) ||
+	    token->type != OPAL_DTA_TOKENID_TOKEN ||
+	    token->pos[0] != match)
+		return false;
+	return true;
+}
+
 static u8 response_status(const struct parsed_resp *resp)
 {
-	if (token_type(resp, 0) == OPAL_DTA_TOKENID_TOKEN &&
-	    response_get_token(resp, 0) == OPAL_ENDOFSESSION) {
+	const struct opal_resp_tok *tok;
+
+	tok = response_get_token(resp, 0);
+	if (response_token_matches(tok, OPAL_ENDOFSESSION))
 		return 0;
-	}
 
 	if (resp->num < 5)
 		return DTAERROR_NO_METHOD_STATUS;
 
-	if (token_type(resp, resp->num - 1) != OPAL_DTA_TOKENID_TOKEN ||
-	    token_type(resp, resp->num - 5) != OPAL_DTA_TOKENID_TOKEN ||
-	    response_get_token(resp, resp->num - 1) != OPAL_ENDLIST ||
-	    response_get_token(resp, resp->num - 5) != OPAL_STARTLIST)
+	tok = response_get_token(resp, resp->num - 5);
+	if (!response_token_matches(tok, OPAL_STARTLIST))
+		return DTAERROR_NO_METHOD_STATUS;
+
+	tok = response_get_token(resp, resp->num - 1);
+	if (!response_token_matches(tok, OPAL_ENDLIST))
 		return DTAERROR_NO_METHOD_STATUS;
 
 	return response_get_u64(resp, resp->num - 4);
-- 
1.8.3.1

[PATCHv2 3/5] block/sed: Check received header lengths

[Jon Derrick]

Add a buffer size check against discovery and response header lengths
before we loop over their buffers.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 block/sed-opal.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index d3d6db2..4fc4d7b 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -411,10 +411,17 @@ static int opal_discovery0_end(struct opal_dev *dev)
 	const struct d0_header *hdr = (struct d0_header *)dev->resp;
 	const u8 *epos = dev->resp, *cpos = dev->resp;
 	u16 comid = 0;
+	u32 hlen = be32_to_cpu(hdr->length);
 
-	print_buffer(dev->resp, be32_to_cpu(hdr->length));
+	print_buffer(dev->resp, hlen);
 
-	epos += be32_to_cpu(hdr->length); /* end of buffer */
+	if (hlen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
+		pr_warn("Discovery length overflows buffer (%zu+%u)/%u\n",
+			sizeof(*hdr), hlen, IO_BUFFER_LENGTH);
+		return -EFAULT;
+	}
+
+	epos += hlen; /* end of buffer */
 	cpos += sizeof(*hdr); /* current position on buffer */
 
 	while (cpos < epos && supported) {
@@ -784,6 +791,7 @@ static int response_parse(const u8 *buf, size_t length,
 	int total;
 	ssize_t token_length;
 	const u8 *pos;
+	u32 clen, plen, slen;
 
 	if (!buf)
 		return -EFAULT;
@@ -795,17 +803,16 @@ static int response_parse(const u8 *buf, size_t length,
 	pos = buf;
 	pos += sizeof(*hdr);
 
-	pr_debug("Response size: cp: %d, pkt: %d, subpkt: %d\n",
-		 be32_to_cpu(hdr->cp.length),
-		 be32_to_cpu(hdr->pkt.length),
-		 be32_to_cpu(hdr->subpkt.length));
-
-	if (hdr->cp.length == 0 || hdr->pkt.length == 0 ||
-	    hdr->subpkt.length == 0) {
-		pr_err("Bad header length. cp: %d, pkt: %d, subpkt: %d\n",
-		       be32_to_cpu(hdr->cp.length),
-		       be32_to_cpu(hdr->pkt.length),
-		       be32_to_cpu(hdr->subpkt.length));
+	clen = be32_to_cpu(hdr->cp.length);
+	plen = be32_to_cpu(hdr->pkt.length);
+	slen = be32_to_cpu(hdr->subpkt.length);
+	pr_debug("Response size: cp: %u, pkt: %u, subpkt: %u\n",
+		 clen, plen, slen);
+
+	if (clen == 0 || plen == 0 || slen == 0 ||
+	    slen > IO_BUFFER_LENGTH - sizeof(*hdr)) {
+		pr_err("Bad header length. cp: %u, pkt: %u, subpkt: %u\n",
+		       clen, plen, slen);
 		print_buffer(pos, sizeof(*hdr));
 		return -EINVAL;
 	}
@@ -814,7 +821,7 @@ static int response_parse(const u8 *buf, size_t length,
 		return -EFAULT;
 
 	iter = resp->toks;
-	total = be32_to_cpu(hdr->subpkt.length);
+	total = slen;
 	print_buffer(pos, total);
 	while (total > 0) {
 		if (pos[0] <= TINY_ATOM_BYTE) /* tiny atom */
-- 
1.8.3.1

[PATCHv2 4/5] block/sed: Embed function data into the function sequence

[Jon Derrick]

By embedding the function data with the function sequence, this
eliminates a lot of the code that needs to set it in other places.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 block/sed-opal.c | 358 +++++++++++++++++++++----------------------------------
 1 file changed, 138 insertions(+), 220 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 4fc4d7b..e2e3228 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -34,7 +34,11 @@
 #define IO_BUFFER_LENGTH 2048
 #define MAX_TOKS 64
 
-typedef int (*opal_step)(struct opal_dev *dev);
+typedef struct opal_step {
+	int (*fn)(struct opal_dev *dev, void *data);
+	void *data;
+} opal_step;
+typedef int (cont_fn)(struct opal_dev *dev);
 
 enum opal_atom_width {
 	OPAL_WIDTH_TINY,
@@ -80,8 +84,7 @@ struct opal_dev {
 	void *data;
 	sec_send_recv *send_recv;
 
-	const opal_step *funcs;
-	void **func_data;
+	opal_step *funcs;
 	int state;
 	struct mutex dev_lock;
 	u16 comid;
@@ -213,8 +216,6 @@ struct opal_dev {
 		{ 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x08, 0x03 },
 };
 
-typedef int (cont_fn)(struct opal_dev *dev);
-
 static int end_opal_session_error(struct opal_dev *dev);
 
 struct opal_suspend_data {
@@ -375,15 +376,15 @@ static void check_geometry(struct opal_dev *dev, const void *data)
 
 static int next(struct opal_dev *dev)
 {
-	opal_step func;
+	opal_step *func;
 	int error = 0;
 
 	do {
-		func = dev->funcs[dev->state];
-		if (!func)
+		func = &dev->funcs[dev->state];
+		if (!func->fn)
 			break;
 
-		error = func(dev);
+		error = func->fn(dev, func->data);
 		if (error) {
 			pr_err("Error on step function: %d with error %d: %s\n",
 			       dev->state, error,
@@ -483,7 +484,7 @@ static int opal_discovery0_end(struct opal_dev *dev)
 	return 0;
 }
 
-static int opal_discovery0(struct opal_dev *dev)
+static int opal_discovery0(struct opal_dev *dev, void *data)
 {
 	int ret;
 
@@ -1018,7 +1019,7 @@ static int finalize_and_send(struct opal_dev *dev, cont_fn cont)
 	return opal_send_recv(dev, cont);
 }
 
-static int gen_key(struct opal_dev *dev)
+static int gen_key(struct opal_dev *dev, void *data)
 {
 	const u8 *method;
 	u8 uid[OPAL_UID_LENGTH];
@@ -1072,15 +1073,14 @@ static int get_active_key_cont(struct opal_dev *dev)
 	return 0;
 }
 
-static int get_active_key(struct opal_dev *dev)
+static int get_active_key(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
 	int err = 0;
-	u8 *lr;
+	u8 *lr = data;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
-	lr = dev->func_data[dev->state];
 
 	err = build_locking_range(uid, sizeof(uid), *lr);
 	if (err)
@@ -1163,17 +1163,16 @@ static inline int enable_global_lr(struct opal_dev *dev, u8 *uid,
 	return err;
 }
 
-static int setup_locking_range(struct opal_dev *dev)
+static int setup_locking_range(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
-	struct opal_user_lr_setup *setup;
+	struct opal_user_lr_setup *setup = data;
 	u8 lr;
 	int err = 0;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
 
-	setup = dev->func_data[dev->state];
 	lr = setup->session.opal_key.lr;
 	err = build_locking_range(uid, sizeof(uid), lr);
 	if (err)
@@ -1286,20 +1285,19 @@ static int start_generic_opal_session(struct opal_dev *dev,
 	return finalize_and_send(dev, start_opal_session_cont);
 }
 
-static int start_anybodyASP_opal_session(struct opal_dev *dev)
+static int start_anybodyASP_opal_session(struct opal_dev *dev, void *data)
 {
 	return start_generic_opal_session(dev, OPAL_ANYBODY_UID,
 					  OPAL_ADMINSP_UID, NULL, 0);
 }
 
-static int start_SIDASP_opal_session(struct opal_dev *dev)
+static int start_SIDASP_opal_session(struct opal_dev *dev, void *data)
 {
 	int ret;
 	const u8 *key = dev->prev_data;
-	struct opal_key *okey;
 
 	if (!key) {
-		okey = dev->func_data[dev->state];
+		const struct opal_key *okey = data;
 		ret = start_generic_opal_session(dev, OPAL_SID_UID,
 						 OPAL_ADMINSP_UID,
 						 okey->key,
@@ -1314,22 +1312,21 @@ static int start_SIDASP_opal_session(struct opal_dev *dev)
 	return ret;
 }
 
-static inline int start_admin1LSP_opal_session(struct opal_dev *dev)
+static inline int start_admin1LSP_opal_session(struct opal_dev *dev, void *data)
 {
-	struct opal_key *key = dev->func_data[dev->state];
-
+	struct opal_key *key = data;
 	return start_generic_opal_session(dev, OPAL_ADMIN1_UID,
 					  OPAL_LOCKINGSP_UID,
 					  key->key, key->key_len);
 }
 
-static int start_auth_opal_session(struct opal_dev *dev)
+static int start_auth_opal_session(struct opal_dev *dev, void *data)
 {
+	struct opal_session_info *session = data;
 	u8 lk_ul_user[OPAL_UID_LENGTH];
+	size_t keylen = session->opal_key.key_len;
 	int err = 0;
 
-	struct opal_session_info *session = dev->func_data[dev->state];
-	size_t keylen = session->opal_key.key_len;
 	u8 *key = session->opal_key.key;
 	u32 hsn = GENERIC_HOST_SESSION_NUM;
 
@@ -1379,7 +1376,7 @@ static int start_auth_opal_session(struct opal_dev *dev)
 	return finalize_and_send(dev, start_opal_session_cont);
 }
 
-static int revert_tper(struct opal_dev *dev)
+static int revert_tper(struct opal_dev *dev, void *data)
 {
 	int err = 0;
 
@@ -1401,9 +1398,9 @@ static int revert_tper(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int internal_activate_user(struct opal_dev *dev)
+static int internal_activate_user(struct opal_dev *dev, void *data)
 {
-	struct opal_session_info *session = dev->func_data[dev->state];
+	struct opal_session_info *session = data;
 	u8 uid[OPAL_UID_LENGTH];
 	int err = 0;
 
@@ -1436,15 +1433,14 @@ static int internal_activate_user(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int erase_locking_range(struct opal_dev *dev)
+static int erase_locking_range(struct opal_dev *dev, void *data)
 {
-	struct opal_session_info *session;
+	struct opal_session_info *session = data;
 	u8 uid[OPAL_UID_LENGTH];
 	int err = 0;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
-	session = dev->func_data[dev->state];
 
 	if (build_locking_range(uid, sizeof(uid), session->opal_key.lr) < 0)
 		return -ERANGE;
@@ -1463,9 +1459,9 @@ static int erase_locking_range(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int set_mbr_done(struct opal_dev *dev)
+static int set_mbr_done(struct opal_dev *dev, void *data)
 {
-	u8 mbr_done_tf = *(u8 *)dev->func_data[dev->state];
+	u8 mbr_done_tf = *(u8 *)data;
 	int err = 0;
 
 	clear_opal_cmd(dev);
@@ -1495,9 +1491,9 @@ static int set_mbr_done(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int set_mbr_enable_disable(struct opal_dev *dev)
+static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
 {
-	u8 mbr_en_dis = *(u8 *)dev->func_data[dev->state];
+	u8 mbr_en_dis = *(u8 *)data;
 	int err = 0;
 
 	clear_opal_cmd(dev);
@@ -1554,11 +1550,10 @@ static int generic_pw_cmd(u8 *key, size_t key_len, u8 *cpin_uid,
 	return err;
 }
 
-static int set_new_pw(struct opal_dev *dev)
+static int set_new_pw(struct opal_dev *dev, void *data)
 {
 	u8 cpin_uid[OPAL_UID_LENGTH];
-	struct opal_session_info *usr = dev->func_data[dev->state];
-
+	struct opal_session_info *usr = data;
 
 	memcpy(cpin_uid, opaluid[OPAL_C_PIN_ADMIN1], OPAL_UID_LENGTH);
 
@@ -1579,10 +1574,10 @@ static int set_new_pw(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int set_sid_cpin_pin(struct opal_dev *dev)
+static int set_sid_cpin_pin(struct opal_dev *dev, void *data)
 {
 	u8 cpin_uid[OPAL_UID_LENGTH];
-	struct opal_key *key = dev->func_data[dev->state];
+	struct opal_key *key = data;
 
 	memcpy(cpin_uid, opaluid[OPAL_C_PIN_SID], OPAL_UID_LENGTH);
 
@@ -1593,18 +1588,16 @@ static int set_sid_cpin_pin(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int add_user_to_lr(struct opal_dev *dev)
+static int add_user_to_lr(struct opal_dev *dev, void *data)
 {
 	u8 lr_buffer[OPAL_UID_LENGTH];
 	u8 user_uid[OPAL_UID_LENGTH];
-	struct opal_lock_unlock *lkul;
+	struct opal_lock_unlock *lkul = data;
 	int err = 0;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
 
-	lkul = dev->func_data[dev->state];
-
 	memcpy(lr_buffer, opaluid[OPAL_LOCKINGRANGE_ACE_RDLOCKED],
 	       OPAL_UID_LENGTH);
 
@@ -1671,11 +1664,11 @@ static int add_user_to_lr(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int lock_unlock_locking_range(struct opal_dev *dev)
+static int lock_unlock_locking_range(struct opal_dev *dev, void *data)
 {
 	u8 lr_buffer[OPAL_UID_LENGTH];
 	const u8 *method;
-	struct opal_lock_unlock *lkul;
+	struct opal_lock_unlock *lkul = data;
 	u8 read_locked = 1, write_locked = 1;
 	int err = 0;
 
@@ -1683,7 +1676,6 @@ static int lock_unlock_locking_range(struct opal_dev *dev)
 	set_comid(dev, dev->comid);
 
 	method = opalmethod[OPAL_SET];
-	lkul = dev->func_data[dev->state];
 	if (build_locking_range(lr_buffer, sizeof(lr_buffer),
 				lkul->session.opal_key.lr) < 0)
 		return -ERANGE;
@@ -1735,19 +1727,18 @@ static int lock_unlock_locking_range(struct opal_dev *dev)
 }
 
 
-static int lock_unlock_locking_range_sum(struct opal_dev *dev)
+static int lock_unlock_locking_range_sum(struct opal_dev *dev, void *data)
 {
 	u8 lr_buffer[OPAL_UID_LENGTH];
 	u8 read_locked = 1, write_locked = 1;
 	const u8 *method;
-	struct opal_lock_unlock *lkul;
+	struct opal_lock_unlock *lkul = data;
 	int ret;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
 
 	method = opalmethod[OPAL_SET];
-	lkul = dev->func_data[dev->state];
 	if (build_locking_range(lr_buffer, sizeof(lr_buffer),
 				lkul->session.opal_key.lr) < 0)
 		return -ERANGE;
@@ -1778,9 +1769,9 @@ static int lock_unlock_locking_range_sum(struct opal_dev *dev)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int activate_lsp(struct opal_dev *dev)
+static int activate_lsp(struct opal_dev *dev, void *data)
 {
-	struct opal_lr_act *opal_act;
+	struct opal_lr_act *opal_act = data;
 	u8 user_lr[OPAL_UID_LENGTH];
 	u8 uint_3 = 0x83;
 	int err = 0, i;
@@ -1788,8 +1779,6 @@ static int activate_lsp(struct opal_dev *dev)
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
 
-	opal_act = dev->func_data[dev->state];
-
 	add_token_u8(&err, dev, OPAL_CALL);
 	add_token_bytestring(&err, dev, opaluid[OPAL_LOCKINGSP_UID],
 			     OPAL_UID_LENGTH);
@@ -1854,7 +1843,7 @@ static int get_lsp_lifecycle_cont(struct opal_dev *dev)
 }
 
 /* Determine if we're in the Manufactured Inactive or Active state */
-static int get_lsp_lifecycle(struct opal_dev *dev)
+static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
 {
 	int err = 0;
 
@@ -1915,14 +1904,13 @@ static int get_msid_cpin_pin_cont(struct opal_dev *dev)
 	return 0;
 }
 
-static int get_msid_cpin_pin(struct opal_dev *dev)
+static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
 {
 	int err = 0;
 
 	clear_opal_cmd(dev);
 	set_comid(dev, dev->comid);
 
-
 	add_token_u8(&err, dev, OPAL_CALL);
 	add_token_bytestring(&err, dev, opaluid[OPAL_C_PIN_MSID],
 			     OPAL_UID_LENGTH);
@@ -1963,7 +1951,7 @@ static int build_end_opal_session(struct opal_dev *dev)
 	return err;
 }
 
-static int end_opal_session(struct opal_dev *dev)
+static int end_opal_session(struct opal_dev *dev, void *data)
 {
 	int ret = build_end_opal_session(dev);
 
@@ -1974,9 +1962,9 @@ static int end_opal_session(struct opal_dev *dev)
 
 static int end_opal_session_error(struct opal_dev *dev)
 {
-	const opal_step error_end_session[] = {
-		end_opal_session,
-		NULL,
+	opal_step error_end_session[] = {
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	dev->funcs = error_end_session;
 	dev->state = 0;
@@ -1984,21 +1972,20 @@ static int end_opal_session_error(struct opal_dev *dev)
 }
 
 static inline void setup_opal_dev(struct opal_dev *dev,
-				  const opal_step *funcs)
+				  opal_step *funcs)
 {
 	dev->state = 0;
 	dev->funcs = funcs;
 	dev->tsn = 0;
 	dev->hsn = 0;
-	dev->func_data = NULL;
 	dev->prev_data = NULL;
 }
 
 static int check_opal_support(struct opal_dev *dev)
 {
-	static const opal_step funcs[] = {
-		opal_discovery0,
-		NULL
+	opal_step funcs[] = {
+		{ opal_discovery0, },
+		{ NULL, }
 	};
 	int ret;
 
@@ -2034,24 +2021,18 @@ struct opal_dev *init_opal_dev(void *data, sec_send_recv *send_recv)
 static int opal_secure_erase_locking_range(struct opal_dev *dev,
 					   struct opal_session_info *opal_session)
 {
-	void *data[3] = { NULL };
-	static const opal_step erase_funcs[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		get_active_key,
-		gen_key,
-		end_opal_session,
-		NULL,
+	opal_step erase_funcs[] = {
+		{ opal_discovery0, },
+		{ start_auth_opal_session, opal_session },
+		{ get_active_key, &opal_session->opal_key.lr },
+		{ gen_key, },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, erase_funcs);
-
-	dev->func_data = data;
-	dev->func_data[1] = opal_session;
-	dev->func_data[2] = &opal_session->opal_key.lr;
-
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2060,23 +2041,17 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
 static int opal_erase_locking_range(struct opal_dev *dev,
 				    struct opal_session_info *opal_session)
 {
-	void *data[3] = { NULL };
-	static const opal_step erase_funcs[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		erase_locking_range,
-		end_opal_session,
-		NULL,
+	opal_step erase_funcs[] = {
+		{ opal_discovery0, },
+		{ start_auth_opal_session, opal_session },
+		{ erase_locking_range, opal_session },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, erase_funcs);
-
-	dev->func_data = data;
-	dev->func_data[1] = opal_session;
-	dev->func_data[2] = opal_session;
-
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2085,16 +2060,15 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 					  struct opal_mbr_data *opal_mbr)
 {
-	void *func_data[6] = { NULL };
-	static const opal_step mbr_funcs[] = {
-		opal_discovery0,
-		start_admin1LSP_opal_session,
-		set_mbr_done,
-		end_opal_session,
-		start_admin1LSP_opal_session,
-		set_mbr_enable_disable,
-		end_opal_session,
-		NULL,
+	opal_step mbr_funcs[] = {
+		{ opal_discovery0, },
+		{ start_admin1LSP_opal_session, &opal_mbr->key },
+		{ set_mbr_done, &opal_mbr->enable_disable },
+		{ end_opal_session, },
+		{ start_admin1LSP_opal_session, &opal_mbr->key },
+		{ set_mbr_enable_disable, &opal_mbr->enable_disable },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
@@ -2104,11 +2078,6 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, mbr_funcs);
-	dev->func_data = func_data;
-	dev->func_data[1] = &opal_mbr->key;
-	dev->func_data[2] = &opal_mbr->enable_disable;
-	dev->func_data[4] = &opal_mbr->key;
-	dev->func_data[5] = &opal_mbr->enable_disable;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2135,13 +2104,12 @@ static int opal_save(struct opal_dev *dev, struct opal_lock_unlock *lk_unlk)
 static int opal_add_user_to_lr(struct opal_dev *dev,
 			       struct opal_lock_unlock *lk_unlk)
 {
-	void *func_data[3] = { NULL };
-	static const opal_step funcs[] = {
-		opal_discovery0,
-		start_admin1LSP_opal_session,
-		add_user_to_lr,
-		end_opal_session,
-		NULL
+	opal_step funcs[] = {
+		{ opal_discovery0, },
+		{ start_admin1LSP_opal_session, &lk_unlk->session.opal_key },
+		{ add_user_to_lr, lk_unlk },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
@@ -2164,9 +2132,6 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, funcs);
-	dev->func_data = func_data;
-	dev->func_data[1] = &lk_unlk->session.opal_key;
-	dev->func_data[2] = lk_unlk;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2174,55 +2139,44 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 
 static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal)
 {
-	void *data[2] = { NULL };
-	static const opal_step revert_funcs[] = {
-		opal_discovery0,
-		start_SIDASP_opal_session,
-		revert_tper, /* controller will terminate session */
-		NULL,
+	opal_step revert_funcs[] = {
+		{ opal_discovery0, },
+		{ start_SIDASP_opal_session, opal },
+		{ revert_tper, }, /* controller will terminate session */
+		{ NULL, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, revert_funcs);
-	dev->func_data = data;
-	dev->func_data[1] = opal;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
 
-static int __opal_lock_unlock_sum(struct opal_dev *dev)
+static int __opal_lock_unlock(struct opal_dev *dev,
+			      struct opal_lock_unlock *lk_unlk)
 {
-	static const opal_step ulk_funcs_sum[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		lock_unlock_locking_range_sum,
-		end_opal_session,
-		NULL
+	opal_step _unlock_funcs[] = {
+		{ opal_discovery0, },
+		{ start_auth_opal_session, &lk_unlk->session },
+		{ NULL, lk_unlk },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 
-	dev->funcs = ulk_funcs_sum;
-	return next(dev);
-}
-
-static int __opal_lock_unlock(struct opal_dev *dev)
-{
-	static const opal_step _unlock_funcs[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		lock_unlock_locking_range,
-		end_opal_session,
-		NULL
-	};
+	if (lk_unlk->session.sum)
+		_unlock_funcs[2].fn = lock_unlock_locking_range_sum;
+	else
+		_unlock_funcs[2].fn = lock_unlock_locking_range;
 
 	dev->funcs = _unlock_funcs;
 	return next(dev);
 }
 
-static int opal_lock_unlock(struct opal_dev *dev, struct opal_lock_unlock *lk_unlk)
+static int opal_lock_unlock(struct opal_dev *dev,
+			    struct opal_lock_unlock *lk_unlk)
 {
-	void *func_data[3] = { NULL };
 	int ret;
 
 	if (lk_unlk->session.who < OPAL_ADMIN1 ||
@@ -2231,32 +2185,23 @@ static int opal_lock_unlock(struct opal_dev *dev, struct opal_lock_unlock *lk_un
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, NULL);
-	dev->func_data = func_data;
-	dev->func_data[1] = &lk_unlk->session;
-	dev->func_data[2] = lk_unlk;
-
-	if (lk_unlk->session.sum)
-		ret = __opal_lock_unlock_sum(dev);
-	else
-		ret = __opal_lock_unlock(dev);
-
+	ret = __opal_lock_unlock(dev, lk_unlk);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
 
 static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 {
-	static const opal_step owner_funcs[] = {
-		opal_discovery0,
-		start_anybodyASP_opal_session,
-		get_msid_cpin_pin,
-		end_opal_session,
-		start_SIDASP_opal_session,
-		set_sid_cpin_pin,
-		end_opal_session,
-		NULL
+	opal_step owner_funcs[] = {
+		{ opal_discovery0, },
+		{ start_anybodyASP_opal_session, },
+		{ get_msid_cpin_pin, },
+		{ end_opal_session, },
+		{ start_SIDASP_opal_session, opal },
+		{ set_sid_cpin_pin, opal },
+		{ end_opal_session, },
+		{ NULL, }
 	};
-	void *data[6] = { NULL };
 	int ret;
 
 	if (!dev)
@@ -2264,9 +2209,6 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, owner_funcs);
-	dev->func_data = data;
-	dev->func_data[4] = opal;
-	dev->func_data[5] = opal;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2274,14 +2216,13 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 
 static int opal_activate_lsp(struct opal_dev *dev, struct opal_lr_act *opal_lr_act)
 {
-	void *data[4] = { NULL };
-	static const opal_step active_funcs[] = {
-		opal_discovery0,
-		start_SIDASP_opal_session, /* Open session as SID auth */
-		get_lsp_lifecycle,
-		activate_lsp,
-		end_opal_session,
-		NULL
+	opal_step active_funcs[] = {
+		{ opal_discovery0, },
+		{ start_SIDASP_opal_session, &opal_lr_act->key },
+		{ get_lsp_lifecycle, },
+		{ activate_lsp, opal_lr_act },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
@@ -2290,9 +2231,6 @@ static int opal_activate_lsp(struct opal_dev *dev, struct opal_lr_act *opal_lr_a
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, active_funcs);
-	dev->func_data = data;
-	dev->func_data[1] = &opal_lr_act->key;
-	dev->func_data[3] = opal_lr_act;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2301,21 +2239,17 @@ static int opal_activate_lsp(struct opal_dev *dev, struct opal_lr_act *opal_lr_a
 static int opal_setup_locking_range(struct opal_dev *dev,
 				    struct opal_user_lr_setup *opal_lrs)
 {
-	void *data[3] = { NULL };
-	static const opal_step lr_funcs[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		setup_locking_range,
-		end_opal_session,
-		NULL,
+	opal_step lr_funcs[] = {
+		{ opal_discovery0, },
+		{ start_auth_opal_session, &opal_lrs->session },
+		{ setup_locking_range, opal_lrs },
+		{ end_opal_session, },
+		{ NULL, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, lr_funcs);
-	dev->func_data = data;
-	dev->func_data[1] = &opal_lrs->session;
-	dev->func_data[2] = opal_lrs;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2323,14 +2257,13 @@ static int opal_setup_locking_range(struct opal_dev *dev,
 
 static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 {
-	static const opal_step pw_funcs[] = {
-		opal_discovery0,
-		start_auth_opal_session,
-		set_new_pw,
-		end_opal_session,
-		NULL
+	opal_step pw_funcs[] = {
+		{ opal_discovery0, },
+		{ start_auth_opal_session, &opal_pw->session },
+		{ set_new_pw, &opal_pw->new_user_pw },
+		{ end_opal_session, },
+		{ NULL }
 	};
-	void *data[3] = { NULL };
 	int ret;
 
 	if (opal_pw->session.who < OPAL_ADMIN1 ||
@@ -2341,10 +2274,6 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, pw_funcs);
-	dev->func_data = data;
-	dev->func_data[1] = (void *) &opal_pw->session;
-	dev->func_data[2] = (void *) &opal_pw->new_user_pw;
-
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2353,14 +2282,13 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 static int opal_activate_user(struct opal_dev *dev,
 			      struct opal_session_info *opal_session)
 {
-	static const opal_step act_funcs[] = {
-		opal_discovery0,
-		start_admin1LSP_opal_session,
-		internal_activate_user,
-		end_opal_session,
-		NULL
+	opal_step act_funcs[] = {
+		{ opal_discovery0, },
+		{ start_admin1LSP_opal_session, &opal_session->opal_key },
+		{ internal_activate_user, opal_session },
+		{ end_opal_session, },
+		{ NULL, }
 	};
-	void *data[3] = { NULL };
 	int ret;
 
 	/* We can't activate Admin1 it's active as manufactured */
@@ -2372,9 +2300,6 @@ static int opal_activate_user(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, act_funcs);
-	dev->func_data = data;
-	dev->func_data[1] = &opal_session->opal_key;
-	dev->func_data[2] = opal_session;
 	ret = next(dev);
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2383,7 +2308,6 @@ static int opal_activate_user(struct opal_dev *dev,
 bool opal_unlock_from_suspend(struct opal_dev *dev)
 {
 	struct opal_suspend_data *suspend;
-	void *func_data[3] = { NULL };
 	bool was_failure = false;
 	int ret = 0;
 
@@ -2394,19 +2318,13 @@ bool opal_unlock_from_suspend(struct opal_dev *dev)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev, NULL);
-	dev->func_data = func_data;
 
 	list_for_each_entry(suspend, &dev->unlk_lst, node) {
 		dev->state = 0;
-		dev->func_data[1] = &suspend->unlk.session;
-		dev->func_data[2] = &suspend->unlk;
 		dev->tsn = 0;
 		dev->hsn = 0;
 
-		if (suspend->unlk.session.sum)
-			ret = __opal_lock_unlock_sum(dev);
-		else
-			ret = __opal_lock_unlock(dev);
+		ret = __opal_lock_unlock(dev, &suspend->unlk);
 		if (ret) {
 			pr_warn("Failed to unlock LR %hhu with sum %d\n",
 				suspend->unlk.session.opal_key.lr,
-- 
1.8.3.1

Re: [PATCHv2 4/5] block/sed: Embed function data into the function sequence

[Christoph Hellwig]

Hi Jon,

I think this is a great cleanup!

A few nitpicky comments below:

> -typedef int (*opal_step)(struct opal_dev *dev);
> +typedef struct opal_step {
> +	int (*fn)(struct opal_dev *dev, void *data);
> +	void *data;
> +} opal_step;

no typedefs for structure types, please.

> +	opal_step *funcs;

maybe calls this member steps?

> +static int set_mbr_done(struct opal_dev *dev, void *data)
>  {
> -	u8 mbr_done_tf = *(u8 *)dev->func_data[dev->state];
> +	u8 mbr_done_tf = *(u8 *)data;

No need for casts when going from void * to any pointer type.  There are
a couple more instance below where the cast should be removed as well.

> +static int __opal_lock_unlock(struct opal_dev *dev,
> +			      struct opal_lock_unlock *lk_unlk)
>  {
> +	opal_step _unlock_funcs[] = {
> +		{ opal_discovery0, },
> +		{ start_auth_opal_session, &lk_unlk->session },
> +		{ NULL, lk_unlk },
> +		{ end_opal_session, },
> +		{ NULL, }
>  	};
>  
> +	if (lk_unlk->session.sum)
> +		_unlock_funcs[2].fn = lock_unlock_locking_range_sum;
> +	else
> +		_unlock_funcs[2].fn = lock_unlock_locking_range;
>  
>  	dev->funcs = _unlock_funcs;

I would suggest to just have two different arrays, and merge
__opal_lock_unlock into opal_lock_unlock.  E.g. something like:

static int opal_lock_unlock(struct opal_dev *dev,
		struct opal_lock_unlock *lk_unlk)
{
	const struct opal_step unlock_funcs[] = {
		{ opal_discovery0, },
		{ start_auth_opal_session, &lk_unlk->session },
		{ lock_unlock_locking_range, lk_unlk },
		{ end_opal_session, },
		{ NULL, }
	};
	const struct opal_step unlock_sun_funcs[] = {
		{ opal_discovery0, },
		{ start_auth_opal_session, &lk_unlk->session },
		{ lock_unlock_locking_range_sum, lk_unlk },
		{ end_opal_session, },
		{ NULL, }
	};
	int ret;

	if (lk_unlk->session.who < OPAL_ADMIN1 ||
	    lk_unlk->session.who > OPAL_USER9)
		return -EINVAL;

	mutex_lock(&dev->dev_lock);
	setup_opal_dev(dev, lk_unlk->session.sum ?
			unlock_sum_funcs : unlock_funcs);
	ret = next(dev);
	mutex_unlock(&dev->dev_lock);
	return ret;
}

and yes, I noticed that all the opal_step structures really should
be marked const, especially given that they contain function pointers
and are potential exploit targets.  Please apply that everywhere.


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Re: [PATCHv2 4/5] block/sed: Embed function data into the function sequence

[Scott Bauer]

On 02/18/2017 01:36 AM, Christoph Hellwig wrote:
> Hi Jon,
> 
> I think this is a great cleanup!
> 
> A few nitpicky comments below:
> 
>> -typedef int (*opal_step)(struct opal_dev *dev);
>> +typedef struct opal_step {
>> +	int (*fn)(struct opal_dev *dev, void *data);
>> +	void *data;
>> +} opal_step;
> 
> no typedefs for structure types, please.
> 
>> +	opal_step *funcs;
> 
> maybe calls this member steps?
> 
>> +static int set_mbr_done(struct opal_dev *dev, void *data)
>>  {
>> -	u8 mbr_done_tf = *(u8 *)dev->func_data[dev->state];
>> +	u8 mbr_done_tf = *(u8 *)data;
> 
> No need for casts when going from void * to any pointer type.  There are
> a couple more instance below where the cast should be removed as well.

In this case he's actually casting & dereferencing the pointer, so it should be fine in this scenario?

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Re: [PATCHv2 4/5] block/sed: Embed function data into the function sequence

[Christoph Hellwig]

On Sat, Feb 18, 2017 at 08:52:19AM -0700, Scott Bauer wrote:
> >> +static int set_mbr_done(struct opal_dev *dev, void *data)
> >>  {
> >> -	u8 mbr_done_tf = *(u8 *)dev->func_data[dev->state];
> >> +	u8 mbr_done_tf = *(u8 *)data;
> > 
> > No need for casts when going from void * to any pointer type.  There are
> > a couple more instance below where the cast should be removed as well.
> 
> In this case he's actually casting & dereferencing the pointer, so it should be fine in this scenario?

Oh, right.  As-is we'll obviously need the casts.  But what we could
do instead is the following:

	u8 *mbr_done_tf = data;

	..

	add_token_u8(&err, dev, *mbr_done_tf); /* Done T or F */

or alternatively just pass the whole struct opal_mbr_data pointer
as the private data.

[PATCHv2 5/5] block/sed: Eliminate state variable

[Jon Derrick]

Now that the function data is embedded with the function, there is no
need to carry a device state variable.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
---
 block/sed-opal.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e2e3228..791a40a 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -85,7 +85,6 @@ struct opal_dev {
 	sec_send_recv *send_recv;
 
 	opal_step *funcs;
-	int state;
 	struct mutex dev_lock;
 	u16 comid;
 	u32 hsn;
@@ -377,17 +376,17 @@ static void check_geometry(struct opal_dev *dev, const void *data)
 static int next(struct opal_dev *dev)
 {
 	opal_step *func;
-	int error = 0;
+	int state = 0, error = 0;
 
 	do {
-		func = &dev->funcs[dev->state];
+		func = &dev->funcs[state];
 		if (!func->fn)
 			break;
 
 		error = func->fn(dev, func->data);
 		if (error) {
 			pr_err("Error on step function: %d with error %d: %s\n",
-			       dev->state, error,
+			       state, error,
 			       opal_error_to_human(error));
 
 			/* For each OPAL command we do a discovery0 then we
@@ -397,10 +396,10 @@ static int next(struct opal_dev *dev)
 			 * session. Therefore we shouldn't attempt to terminate
 			 * a session, as one has not yet been created.
 			 */
-			if (dev->state > 1)
+			if (state > 1)
 				return end_opal_session_error(dev);
 		}
-		dev->state++;
+		state++;
 	} while (!error);
 
 	return error;
@@ -1967,14 +1966,12 @@ static int end_opal_session_error(struct opal_dev *dev)
 		{ NULL, }
 	};
 	dev->funcs = error_end_session;
-	dev->state = 0;
 	return next(dev);
 }
 
 static inline void setup_opal_dev(struct opal_dev *dev,
 				  opal_step *funcs)
 {
-	dev->state = 0;
 	dev->funcs = funcs;
 	dev->tsn = 0;
 	dev->hsn = 0;
@@ -2320,7 +2317,6 @@ bool opal_unlock_from_suspend(struct opal_dev *dev)
 	setup_opal_dev(dev, NULL);
 
 	list_for_each_entry(suspend, &dev->unlk_lst, node) {
-		dev->state = 0;
 		dev->tsn = 0;
 		dev->hsn = 0;
 
-- 
1.8.3.1

Re: [PATCHv2 5/5] block/sed: Eliminate state variable

[Christoph Hellwig]

Looks fine:

Reviewed-by: Christoph Hellwig <hch@lst.de>

But I would just fold it into the previous patch.

Re: [PATCHv2 0/5] OPAL patche'd cont'd

[Christoph Hellwig]

On Fri, Feb 17, 2017 at 05:00:24PM -0700, Jon Derrick wrote:
> v1->v2:
> Moved misplaced code from 5/5 to 4/5
> 
> The first three in the series have been reviewed already but I wanted to
> squash them with the next two since they haven't been pulled yet.

Next time please carry the reviewed-by tags over to make everyones
life easier.