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block/sed: Add helper to qualify response tokens

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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 <[email protected]>
Reviewed-by: Scott Bauer <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jon Derrick 2017-02-21 11:59:14 -07:00 • committed by Jens Axboe
commit cccb92417d
1 changed files with 25 additions and 36 deletions
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61
block/sed-opal.c
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@ -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);