[PATCH nvme-7.3 v2 1/4] nvme-fabrics: separate option tokenizer pointer

[raoxu]

From: Xu Rao <raoxu@xxxxxxxxxxxxx>

nvmf_parse_options() currently uses p both for the option returned by
strsep() and for strings allocated by match_strdup().  The former points
into the temporary options buffer while the latter owns a separate
allocation, so the same variable represents two different lifetimes.

Introduce option for the current string token passed to match_token().
Leave p for temporary strings returned by match_strdup(), giving option
tokenization and allocated string storage distinct variables without
changing the parsing logic.

The name option is intentional: options remains the backing buffer for the
full request, option is one comma/newline-delimited entry, and token names
the integer result returned by match_token().

This is a mechanical preparation with no functional change.

Suggested-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Xu Rao <raoxu@xxxxxxxxxxxxx>
---
 drivers/nvme/host/fabrics.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 59f823dfbbcc..1ec6da49167d 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -716,7 +716,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 		const char *buf)
 {
 	substring_t args[MAX_OPT_ARGS];
-	char *options, *o, *p;
+	char *options, *o, *option, *p;
 	int token, ret = 0;
 	size_t nqnlen  = 0;
 	int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO, key_id;
@@ -747,11 +747,11 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 	uuid_copy(&hostid, &nvmf_default_host->id);
 	strscpy(hostnqn, nvmf_default_host->nqn, NVMF_NQN_SIZE);
 
-	while ((p = strsep(&o, ",\n")) != NULL) {
-		if (!*p)
+	while ((option = strsep(&o, ",\n")) != NULL) {
+		if (!*option)
 			continue;
 
-		token = match_token(p, opt_tokens, args);
+		token = match_token(option, opt_tokens, args);
 		opts->mask |= token;
 		switch (token) {
 		case NVMF_OPT_TRANSPORT:
@@ -1068,7 +1068,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 			break;
 		default:
 			pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
-				p);
+				option);
 			ret = -EINVAL;
 			goto out;
 		}
-- 
2.50.1