netdev - Re: [PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported flags

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Message-ID: <20240621110419.GA1098275@kernel.org>
Date: Fri, 21 Jun 2024 12:04:19 +0100
From: Simon Horman <horms@...nel.org>
To: Karol Kolacinski <karol.kolacinski@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com,
	Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [PATCH v2 iwl-net 3/3] ice: Reject pin requests with unsupported
 flags

On Thu, Jun 20, 2024 at 02:27:10PM +0200, Karol Kolacinski wrote:
> From: Jacob Keller <jacob.e.keller@...el.com>
> 
> The driver receives requests for configuring pins via the .enable
> callback of the PTP clock object. These requests come into the driver
> with flags which modify the requested behavior from userspace. Current
> implementation in ice does not reject flags that it doesn't support.
> This causes the driver to incorrectly apply requests with such flags as
> PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it
> is not yet aware of.
> 
> Fix this by properly validating flags in both ice_ptp_cfg_perout and
> ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported
> flags rather than just checking and rejecting known un-supported flags.
> This is preferable, as it ensures better compatibility with future
> kernels.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> ---
> V1 -> V2: adjusted indentation and added NULL config pointer check

Thanks for the update, this version looks good to me.

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