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Subject[PATCH 08/16] block: sed-opal: reuse response_get_token to decrease code duplication
Date
response_get_token had already been in place, its functionality had
been duplicated within response_get_{u64,bytestring} with the same error
handling. Unify the handling by reusing response_get_token within the
other functions.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
---
block/sed-opal.c | 46 +++++++++++++++-------------------------------
1 file changed, 15 insertions(+), 31 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 3f368b14efd9..5cb8034b53c8 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -883,27 +883,19 @@ static size_t response_get_string(const struct parsed_resp *resp, int n,
const char **store)
{
u8 skip;
- const struct opal_resp_tok *token;
+ const struct opal_resp_tok *tok;

*store = NULL;
- if (!resp) {
- pr_debug("Response is NULL\n");
- return 0;
- }
-
- if (n >= resp->num) {
- pr_debug("Response has %d tokens. Can't access %d\n",
- resp->num, n);
+ tok = response_get_token(resp, n);
+ if (IS_ERR(tok))
return 0;
- }

- token = &resp->toks[n];
- if (token->type != OPAL_DTA_TOKENID_BYTESTRING) {
+ if (tok->type != OPAL_DTA_TOKENID_BYTESTRING) {
pr_debug("Token is not a byte string!\n");
return 0;
}

- switch (token->width) {
+ switch (tok->width) {
case OPAL_WIDTH_TINY:
case OPAL_WIDTH_SHORT:
skip = 1;
@@ -919,37 +911,29 @@ static size_t response_get_string(const struct parsed_resp *resp, int n,
return 0;
}

- *store = token->pos + skip;
- return token->len - skip;
+ *store = tok->pos + skip;
+ return tok->len - skip;
}

static u64 response_get_u64(const struct parsed_resp *resp, int n)
{
- if (!resp) {
- pr_debug("Response is NULL\n");
- return 0;
- }
+ const struct opal_resp_tok *tok;

- if (n >= resp->num) {
- pr_debug("Response has %d tokens. Can't access %d\n",
- resp->num, n);
+ tok = response_get_token(resp, n);
+ if (IS_ERR(tok))
return 0;
- }

- if (resp->toks[n].type != OPAL_DTA_TOKENID_UINT) {
- pr_debug("Token is not unsigned it: %d\n",
- resp->toks[n].type);
+ if (tok->type != OPAL_DTA_TOKENID_UINT) {
+ pr_debug("Token is not unsigned int: %d\n", tok->type);
return 0;
}

- if (!(resp->toks[n].width == OPAL_WIDTH_TINY ||
- resp->toks[n].width == OPAL_WIDTH_SHORT)) {
- pr_debug("Atom is not short or tiny: %d\n",
- resp->toks[n].width);
+ if (tok->width != OPAL_WIDTH_TINY && tok->width != OPAL_WIDTH_SHORT) {
+ pr_debug("Atom is not short or tiny: %d\n", tok->width);
return 0;
}

- return resp->toks[n].stored.u;
+ return tok->stored.u;
}

static bool response_token_matches(const struct opal_resp_tok *token, u8 match)
--
2.20.1
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