[PATCH nvme-7.3 v3 3/4] nvme-fabrics: reuse string helper for subsystem NQN

[raoxu]

From: Xu Rao <raoxu at uniontech.com>

The subsystem NQN starts with the same owned-string replacement sequence
as the direct string options handled by nvmf_parse_string_option():
duplicate the matched value, free the previously stored string, and
transfer ownership of the new allocation.

Reuse nvmf_parse_string_option() for that replacement only.  Leave the
existing NQN length validation and discovery-NQN update unchanged.  The
hostnqn and hostid parsing paths are also left untouched.

This removes another copy of the match_strdup(), free and
ownership-transfer sequence without introducing a dedicated helper or
changing option-specific logic.

No functional change is intended.

Suggested-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Signed-off-by: Xu Rao <raoxu at uniontech.com>
---
 drivers/nvme/host/fabrics.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index aab3fd279d0e..24385e777307 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -773,13 +773,9 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 				goto out;
 			break;
 		case NVMF_OPT_NQN:
-			p = match_strdup(args);
-			if (!p) {
-				ret = -ENOMEM;
+			ret = nvmf_parse_string_option(args, &opts->subsysnqn);
+			if (ret)
 				goto out;
-			}
-			kfree(opts->subsysnqn);
-			opts->subsysnqn = p;
 			nqnlen = strlen(opts->subsysnqn);
 			if (nqnlen >= NVMF_NQN_SIZE) {
 				pr_err("%s needs to be < %d bytes\n",
-- 
2.50.1