linux-kernel - [PATCH V2 2/3] nvme: core: switch to non_owner variant of start

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Message-ID: <20241025003722.3630252-3-ming.lei@redhat.com>
Date: Fri, 25 Oct 2024 08:37:19 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Jens Axboe <axboe@...nel.dk>,
	linux-block@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Waiman Long <longman@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	Bart Van Assche <bvanassche@....org>,
	Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V2 2/3] nvme: core: switch to non_owner variant of start_freeze/unfreeze queue

nvme_start_freeze() and nvme_unfreeze() may be called from same context,
so switch them to call non_owner variant of start_freeze/unfreeze queue.

Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 drivers/nvme/host/core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ba6508455e18..66d76a9296b1 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4871,7 +4871,7 @@ void nvme_unfreeze(struct nvme_ctrl *ctrl)
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
 	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
-		blk_mq_unfreeze_queue(ns->queue);
+		blk_mq_unfreeze_queue_non_owner(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 	clear_bit(NVME_CTRL_FROZEN, &ctrl->flags);
 }
@@ -4913,7 +4913,12 @@ void nvme_start_freeze(struct nvme_ctrl *ctrl)
 	set_bit(NVME_CTRL_FROZEN, &ctrl->flags);
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
 	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
-		blk_freeze_queue_start(ns->queue);
+		/*
+		 * Typical non_owner use case is from pci driver, in which
+		 * start_freeze is called from timeout work function, but
+		 * unfreeze is done in reset work context
+		 */
+		blk_freeze_queue_start_non_owner(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }
 EXPORT_SYMBOL_GPL(nvme_start_freeze);
-- 
2.46.0