Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 9 Jan 2023 15:29:44 +0200
From:   Vladimir Oltean <olteanv@gmail.com>
To:     "Hans J. Schultz" <netdev@kapio-technology.com>
Cc:     davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 net-next 2/3] net: dsa: mv88e6xxx: shorten the locked
 section in mv88e6xxx_g1_atu_prob_irq_thread_fn()
Message-ID: <20230109132944.ipczdt3oj2kpfppn@skbuf>
References: <20230108094849.1789162-1-netdev@kapio-technology.com>
 <20230108094849.1789162-3-netdev@kapio-technology.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230108094849.1789162-3-netdev@kapio-technology.com>
Precedence: bulk

On Sun, Jan 08, 2023 at 10:48:48AM +0100, Hans J. Schultz wrote:
> As only the hardware access functions up til and including
> mv88e6xxx_g1_atu_mac_read() called under the interrupt handler
> need to take the chip lock, we release the chip lock after this call.
> The follow up code that handles the violations can run without the
> chip lock held.
> In further patches, the violation handler function will even be
> incompatible with having the chip lock held. This due to an AB/BA
> ordering inversion with rtnl_lock().
> 
> Signed-off-by: Hans J. Schultz <netdev@kapio-technology.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>