linux-kernel - Re: [PATCH net v2] net: pse-pd: tps23881: Fix boolean evaluation for bitmask checks

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Message-ID: <20241002052732.1c0b37eb@kernel.org>
Date: Wed, 2 Oct 2024 05:27:32 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Kyle Swenson
 <kyle.swenson@....tech>, Simon Horman <horms@...nel.org>, Oleksij Rempel
 <o.rempel@...gutronix.de>, thomas.petazzoni@...tlin.com, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>
Subject: Re: [PATCH net v2] net: pse-pd: tps23881: Fix boolean evaluation
 for bitmask checks

On Wed, 2 Oct 2024 05:24:31 -0700 Jakub Kicinski wrote:
> On Wed,  2 Oct 2024 12:23:40 +0200 Kory Maincent wrote:
> > In the case of 4-pair PoE, this led to incorrect enabled and
> > delivering status values.  
> 
> Could you elaborate? The patch looks like a noop I must be missing some
> key aspect..

Reading the discussion on v1 it seems you're doing this to be safe,
because there was a problem with x &= val & MASK; elsewhere.
If that's the case, please resend to net-next and make it clear it's
not a fix.