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nvme: nvme-fc: move tagset removal to nvme_fc_delete_ctrl()

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commit ea3442efab upstream.

Now target is removed from nvme_fc_ctrl_free() which is the ctrl->ref
release handler. And even admin queue is unquiesced there, this way
is definitely wrong because the ctr->ref is grabbed when submitting
command.

And Marco observed that nvme_fc_ctrl_free() can be called from request
completion code path, and trigger kernel warning since request completes
from softirq context.

Fix the issue by moveing target removal into nvme_fc_delete_ctrl(),
which is also aligned with nvme-tcp and nvme-rdma.

Patch originally proposed by Ming Lei, then modified to move the tagset
removal down to after nvme_fc_delete_association() after further testing.

Cc: Marco Patalano <mpatalan@redhat.com>
Cc: Ewan Milne <emilne@redhat.com>
Cc: James Smart <james.smart@broadcom.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Cc: stable@vger.kernel.org
Tested-by: Marco Patalano <mpatalan@redhat.com>
Reviewed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ewan D. Milne
2025-11-10 16:20:00 -05:00
committed by Greg Kroah-Hartman
parent 6492add9a3
commit 17c3a66d7e
1 changed files with 7 additions and 6 deletions
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13
drivers/nvme/host/fc.c
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@@ -2349,17 +2349,11 @@ nvme_fc_ctrl_free(struct kref *ref)
container_of(ref, struct nvme_fc_ctrl, ref);
unsigned long flags;
if (ctrl->ctrl.tagset)
nvme_remove_io_tag_set(&ctrl->ctrl);
/* remove from rport list */
spin_lock_irqsave(&ctrl->rport->lock, flags);
list_del(&ctrl->ctrl_list);
spin_unlock_irqrestore(&ctrl->rport->lock, flags);
nvme_unquiesce_admin_queue(&ctrl->ctrl);
nvme_remove_admin_tag_set(&ctrl->ctrl);
kfree(ctrl->queues);
put_device(ctrl->dev);
@@ -3255,11 +3249,18 @@ nvme_fc_delete_ctrl(struct nvme_ctrl *nctrl)
cancel_work_sync(&ctrl->ioerr_work);
cancel_delayed_work_sync(&ctrl->connect_work);
/*
* kill the association on the link side. this will block
* waiting for io to terminate
*/
nvme_fc_delete_association(ctrl);
if (ctrl->ctrl.tagset)
nvme_remove_io_tag_set(&ctrl->ctrl);
nvme_unquiesce_admin_queue(&ctrl->ctrl);
nvme_remove_admin_tag_set(&ctrl->ctrl);
}
static void