[PATCH 5.15.y 5.10.y 5.4.y 1/2] nvme-tcp: fix potential unbalanced freeze & unfreeze

[Greg KH]

On Sun, Aug 13, 2023 at 05:45:09PM +0300, Sagi Grimberg wrote:
> From: Ming Lei <ming.lei at redhat.com>
> 
> Move start_freeze into nvme_tcp_configure_io_queues(), and there is
> at least two benefits:
> 
> 1) fix unbalanced freeze and unfreeze, since re-connection work may
> fail or be broken by removal
> 
> 2) IO during error recovery can be failfast quickly because nvme fabrics
> unquiesces queues after teardown.
> 
> One side-effect is that !mpath request may timeout during connecting
> because of queue topo change, but that looks not one big deal:
> 
> 1) same problem exists with current code base
> 
> 2) compared with !mpath, mpath use case is dominant
> 
> Fixes: 2875b0aecabe ("nvme-tcp: fix controller reset hang during traffic")
> Cc: stable at vger.kernel.org
> Signed-off-by: Ming Lei <ming.lei at redhat.com>
> Tested-by: Yi Zhang <yi.zhang at redhat.com>
> Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
> Signed-off-by: Keith Busch <kbusch at kernel.org>
> ---
>  drivers/nvme/host/tcp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

All now queued up, thanks.

greg k-h