nvmet: return a specified error it subsys_alloc fails

nvmet_subsys_alloc() returns its pointer or NULL if it fails.  We can
see three different steps in this function:
  1. memory allocation
  2. argument check
  3. memory allocation for string

But now the callers of this function do not seem to handle case 2 by
returning -ENOMEM only even if it fails with an invalid parameter.

This patch specifies error codes so that caller can pass it to its own
caller.

Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>.
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 1c1776c3e316..24e0a36392d9 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1367,7 +1367,7 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
 
 	subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
 	if (!subsys)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */
 	/* generate a random serial number as our controllers are ephemeral: */
@@ -1383,14 +1383,14 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
 	default:
 		pr_err("%s: Unknown Subsystem type - %d\n", __func__, type);
 		kfree(subsys);
-		return NULL;
+		return ERR_PTR(-EINVAL);
 	}
 	subsys->type = type;
 	subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE,
 			GFP_KERNEL);
 	if (!subsys->subsysnqn) {
 		kfree(subsys);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	kref_init(&subsys->ref);