This is a note to let you know that I've just added the patch titled
nvmet: remove unnecessary ctrl parameter
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nvmet-remove-unnecessary-ctrl-parameter.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bdbfd8554888a491a61677055d25203c3788568a
Author: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Date: Tue Mar 9 17:16:32 2021 -0800
nvmet: remove unnecessary ctrl parameter
[ Upstream commit de5878048e11f1ec44164ebb8994de132074367a ]
The function nvmet_ctrl_find_get() accepts out pointer to nvmet_ctrl
structure. This function returns the same error value from two places
that is :- NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR.
Move this to the caller so we can change the return type to nvmet_ctrl.
Now that we can changed the return type, instead of taking out pointer
to the nvmet_ctrl structure remove that function parameter and return
the valid nvmet_ctrl pointer on success and NULL on failure.
Also, add and rename the goto labels for more readability with comments.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Stable-dep-of: 1c22e0295a5e ("nvmet: nul-terminate the NQNs passed in the connect command")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index d109333b95b81..60941a08e589c 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1107,19 +1107,19 @@ static void nvmet_init_cap(struct nvmet_ctrl *ctrl)
ctrl->cap |= NVMET_QUEUE_SIZE - 1;
}
-u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
- struct nvmet_req *req, struct nvmet_ctrl **ret)
+struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
+ const char *hostnqn, u16 cntlid,
+ struct nvmet_req *req)
{
+ struct nvmet_ctrl *ctrl = NULL;
struct nvmet_subsys *subsys;
- struct nvmet_ctrl *ctrl;
- u16 status = 0;
subsys = nvmet_find_get_subsys(req->port, subsysnqn);
if (!subsys) {
pr_warn("connect request for invalid subsystem %s!\n",
subsysnqn);
req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
- return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ goto out;
}
mutex_lock(&subsys->lock);
@@ -1132,20 +1132,21 @@ u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
if (!kref_get_unless_zero(&ctrl->ref))
continue;
- *ret = ctrl;
- goto out;
+ /* ctrl found */
+ goto found;
}
}
+ ctrl = NULL; /* ctrl not found */
pr_warn("could not find controller %d for subsys %s / host %s\n",
cntlid, subsysnqn, hostnqn);
req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
- status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
-out:
+found:
mutex_unlock(&subsys->lock);
nvmet_subsys_put(subsys);
- return status;
+out:
+ return ctrl;
}
u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd)
diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c
index 5e47395afc1d5..58544f9bbc20c 100644
--- a/drivers/nvme/target/fabrics-cmd.c
+++ b/drivers/nvme/target/fabrics-cmd.c
@@ -213,7 +213,7 @@ static void nvmet_execute_io_connect(struct nvmet_req *req)
{
struct nvmf_connect_command *c = &req->cmd->connect;
struct nvmf_connect_data *d;
- struct nvmet_ctrl *ctrl = NULL;
+ struct nvmet_ctrl *ctrl;
u16 qid = le16_to_cpu(c->qid);
u16 status = 0;
@@ -237,11 +237,12 @@ static void nvmet_execute_io_connect(struct nvmet_req *req)
goto out;
}
- status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
- le16_to_cpu(d->cntlid),
- req, &ctrl);
- if (status)
+ ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
+ le16_to_cpu(d->cntlid), req);
+ if (!ctrl) {
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
goto out;
+ }
if (unlikely(qid > ctrl->subsys->max_qid)) {
pr_warn("invalid queue id (%d)\n", qid);
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index c51f8dd01dc48..d625ec3e437b4 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -394,8 +394,9 @@ void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
-u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
- struct nvmet_req *req, struct nvmet_ctrl **ret);
+struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
+ const char *hostnqn, u16 cntlid,
+ struct nvmet_req *req);
void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
