netdev - Re: [PATCH net v2] ice: Fix deadlock on the rtnl

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Message-ID: <Y7bOQoFJQUhsB1kC@unreal>
Date:   Thu, 5 Jan 2023 15:18:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Mateusz Palczewski <mateusz.palczewski@...el.com>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: Re: [PATCH net v2] ice: Fix deadlock on the rtnl_mutex

On Thu, Jan 05, 2023 at 07:05:18AM -0500, Mateusz Palczewski wrote:
> There is a deadlock on rtnl_mutex when attempting to take the lock
> in unregister_netdev() after it has already been taken by
> ethnl_set_channels(). This happened when unregister_netdev() was
> called inside of ice_vsi_rebuild().
> Fix that by removing the unregister_netdev() usage and replace it with
> ice_vsi_clear_rings() that deallocates the tx and rx rings for the VSI.
> 
> Fixes: df0f847915b4 ("ice: Move common functions out of ice_main.c part 6/7")
> Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
> ---
>  v2: Fixed goto unwind to remove code redundancy
> ---
>  drivers/net/ethernet/intel/ice/ice_lib.c | 35 ++++++++++++------------
>  1 file changed, 17 insertions(+), 18 deletions(-)
> 

I think that it will be beneficial to have lockdep trace in commit message too.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>