[PATCH AUTOSEL 5.4 26/40] nvme-core: add cancel tagset helpers

[Sasha Levin]

From: Chao Leng <lengchao at huawei.com>

[ Upstream commit 2547906982e2e6a0d42f8957f55af5bb51a7e55f ]

Add nvme_cancel_tagset and nvme_cancel_admin_tagset for tear down and
reconnection error handling.

Signed-off-by: Chao Leng <lengchao at huawei.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/nvme/host/core.c | 20 ++++++++++++++++++++
 drivers/nvme/host/nvme.h |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c2cabd77884bf..95d77a17375e1 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -317,6 +317,26 @@ bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 }
 EXPORT_SYMBOL_GPL(nvme_cancel_request);
 
+void nvme_cancel_tagset(struct nvme_ctrl *ctrl)
+{
+	if (ctrl->tagset) {
+		blk_mq_tagset_busy_iter(ctrl->tagset,
+				nvme_cancel_request, ctrl);
+		blk_mq_tagset_wait_completed_request(ctrl->tagset);
+	}
+}
+EXPORT_SYMBOL_GPL(nvme_cancel_tagset);
+
+void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl)
+{
+	if (ctrl->admin_tagset) {
+		blk_mq_tagset_busy_iter(ctrl->admin_tagset,
+				nvme_cancel_request, ctrl);
+		blk_mq_tagset_wait_completed_request(ctrl->admin_tagset);
+	}
+}
+EXPORT_SYMBOL_GPL(nvme_cancel_admin_tagset);
+
 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		enum nvme_ctrl_state new_state)
 {
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index e392d6cd92ced..62e5401865fee 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -468,6 +468,8 @@ static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 
 void nvme_complete_rq(struct request *req);
 bool nvme_cancel_request(struct request *req, void *data, bool reserved);
+void nvme_cancel_tagset(struct nvme_ctrl *ctrl);
+void nvme_cancel_admin_tagset(struct nvme_ctrl *ctrl);
 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		enum nvme_ctrl_state new_state);
 bool nvme_wait_reset(struct nvme_ctrl *ctrl);
-- 
2.27.0