linux-kernel - Re: [PATCH v3 net-next 2/3] net: dsa: mv88e6xxx: shorten the locked section in mv88e6xxx_g1_atu_prob_irq_thread

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Date:   Fri, 6 Jan 2023 18:37:59 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Hans J. Schultz" <netdev@...io-technology.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 net-next 2/3] net: dsa: mv88e6xxx: shorten the locked
 section in mv88e6xxx_g1_atu_prob_irq_thread_fn()

On Fri, Jan 06, 2023 at 05:05:28PM +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@...io-technology.com>
> ---

Needs to compile without new warnings patch by patch.

../drivers/net/dsa/mv88e6xxx/global1_atu.c: In function ‘mv88e6xxx_g1_atu_prob_irq_thread_fn’:
../drivers/net/dsa/mv88e6xxx/global1_atu.c:460:1: warning: label ‘out’ defined but not used [-Wunused-label]
  460 | out:
      | ^~~
../drivers/net/dsa/mv88e6xxx/global1_atu.c:460:1: warning: unused label 'out'