nvmet: update AEN list and array at one place

All async events are enqueued via nvmet_add_async_event() which
updates the ctrl->async_event_cmds[] array and additionally an struct
nvmet_async_event is added to the ctrl->async_events list.

Under normal operations the nvmet_async_event_work() updates again
the ctrl->async_event_cmds and removes the corresponding struct
nvmet_async_event from the list again. Though nvmet_sq_destroy() could
be called which calls nvmet_async_events_free() which only updates the
ctrl->async_event_cmds[] array.

Add new functions nvmet_async_events_process() and
nvmet_async_events_free() to process async events, update an array and
the list.

When we destroy submission queue after clearing the aen present on
the ctrl->async list we also loop over ctrl->async_event_cmds[] for
any requests posted by the host for which we don't have the AEN in
the ctrl->async_events list by calling nvmet_async_event_process()
and nvmet_async_events_free().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
[chaitanya.kulkarni@wdc.com
 * Loop over and clear out outstanding requests
 * Update changelog
]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 461987f..576de77 100644 (file)
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -129,27 +129,8 @@ static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
        return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
 }
 
-static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
-{
-       struct nvmet_req *req;
-
-       while (1) {
-               mutex_lock(&ctrl->lock);
-               if (!ctrl->nr_async_event_cmds) {
-                       mutex_unlock(&ctrl->lock);
-                       return;
-               }
-
-               req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
-               mutex_unlock(&ctrl->lock);
-               nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
-       }
-}
-
-static void nvmet_async_event_work(struct work_struct *work)
+static void nvmet_async_events_process(struct nvmet_ctrl *ctrl, u16 status)
 {
-       struct nvmet_ctrl *ctrl =
-               container_of(work, struct nvmet_ctrl, async_event_work);
        struct nvmet_async_event *aen;
        struct nvmet_req *req;
 
@@ -159,20 +140,43 @@ static void nvmet_async_event_work(struct work_struct *work)
                                struct nvmet_async_event, entry);
                if (!aen || !ctrl->nr_async_event_cmds) {
                        mutex_unlock(&ctrl->lock);
-                       return;
+                       break;
                }
 
                req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
-               nvmet_set_result(req, nvmet_async_event_result(aen));
+               if (status == 0)
+                       nvmet_set_result(req, nvmet_async_event_result(aen));
 
                list_del(&aen->entry);
                kfree(aen);
 
                mutex_unlock(&ctrl->lock);
-               nvmet_req_complete(req, 0);
+               nvmet_req_complete(req, status);
        }
 }
 
+static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
+{
+       struct nvmet_req *req;
+
+       mutex_lock(&ctrl->lock);
+       while (ctrl->nr_async_event_cmds) {
+               req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
+               mutex_unlock(&ctrl->lock);
+               nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
+               mutex_lock(&ctrl->lock);
+       }
+       mutex_unlock(&ctrl->lock);
+}
+
+static void nvmet_async_event_work(struct work_struct *work)
+{
+       struct nvmet_ctrl *ctrl =
+               container_of(work, struct nvmet_ctrl, async_event_work);
+
+       nvmet_async_events_process(ctrl, 0);
+}
+
 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
                u8 event_info, u8 log_page)
 {
@@ -753,19 +757,24 @@ static void nvmet_confirm_sq(struct percpu_ref *ref)
 
 void nvmet_sq_destroy(struct nvmet_sq *sq)
 {
+       u16 status = NVME_SC_INTERNAL | NVME_SC_DNR;
+       struct nvmet_ctrl *ctrl = sq->ctrl;
+
        /*
         * If this is the admin queue, complete all AERs so that our
         * queue doesn't have outstanding requests on it.
         */
-       if (sq->ctrl && sq->ctrl->sqs && sq->ctrl->sqs[0] == sq)
-               nvmet_async_events_free(sq->ctrl);
+       if (ctrl && ctrl->sqs && ctrl->sqs[0] == sq) {
+               nvmet_async_events_process(ctrl, status);
+               nvmet_async_events_free(ctrl);
+       }
        percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq);
        wait_for_completion(&sq->confirm_done);
        wait_for_completion(&sq->free_done);
        percpu_ref_exit(&sq->ref);
 
-       if (sq->ctrl) {
-               nvmet_ctrl_put(sq->ctrl);
+       if (ctrl) {
+               nvmet_ctrl_put(ctrl);
                sq->ctrl = NULL; /* allows reusing the queue later */
        }
 }