netdev - Re: [PATCH net 3/3] mlxsw: pci: Fix driver initialization with old firmware

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Message-ID: <20240416143324.GP2320920@kernel.org>
Date: Tue, 16 Apr 2024 15:33:24 +0100
From: Simon Horman <horms@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	mlxsw@...dia.com, Tim 'mithro' Ansell <me@...h.ro>
Subject: Re: [PATCH net 3/3] mlxsw: pci: Fix driver initialization with old
 firmware

On Tue, Apr 16, 2024 at 12:24:16PM +0200, Petr Machata wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> The driver queries the Management Capabilities Mask (MCAM) register
> during initialization to understand if a new and deeper reset flow is
> supported.
> 
> However, not all firmware versions support this register, leading to the
> driver failing to load.
> 
> Fix by treating an error in the register query as an indication that the
> feature is not supported.
> 
> Fixes: f257c73e5356 ("mlxsw: pci: Add support for new reset flow")
> Reported-by: Tim 'mithro' Ansell <me@...h.ro>
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>

Reviewed-by: Simon Horman <horms@...nel.org>