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Subject: Re: [PATCH 1/6] wifi: ath10k: use flexible array in struct
 wmi_host_mem_chunks
From: Kalle Valo <kvalo@kernel.org>
In-Reply-To: 
 <20231213-wmi_host_mem_chunks_flexarray-v1-1-92922d92fa2c@quicinc.com>
References: 
 <20231213-wmi_host_mem_chunks_flexarray-v1-1-92922d92fa2c@quicinc.com>
To: Jeff Johnson <quic_jjohnson@quicinc.com>
Cc: Jeff Johnson <quic_jjohnson@quicinc.com>,
 Kees Cook <keescook@chromium.org>, "Gustavo A. R. Silva"
	<gustavo@embeddedor.com>, <ath10k@lists.infradead.org>,
 <linux-wireless@vger.kernel.org>, <linux-kernel@vger.kernel.org>
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.11.2
Message-ID: <170292524618.424292.1640750049894446616.kvalo@kernel.org>
Date: Mon, 18 Dec 2023 18:47:27 +0000 (UTC)

Jeff Johnson <quic_jjohnson@quicinc.com> wrote:

> Currently struct wmi_host_mem_chunks defines:
>         struct host_memory_chunk items[1];
> 
> Per the guidance in [1] this should be a flexible array. However there
> is a documented requirement:
>         some fw revisions require at least 1 chunk regardless of count
> 
> To satisfy this requirement, follow the guidance from [2] and wrap the
> array in a union which contains both the flexible array and a single
> instance of the underlying struct. Since the footprint of the struct
> is unchanged, no additional driver changes are required.
> 
> No functional changes, compile tested only.
> 
> [1] https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
> [2] https://lore.kernel.org/linux-wireless/202308301529.AC90A9EF98@keescook/
> 
> Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

6 patches applied to ath-next branch of ath.git, thanks.

d2eb318f4b6b wifi: ath10k: use flexible array in struct wmi_host_mem_chunks
72ca7c4073ac wifi: ath10k: use flexible arrays for WMI start scan TLVs
26eb704a46f8 wifi: ath10k: remove struct wmi_pdev_chanlist_update_event
b0c0794b05ec wifi: ath10k: remove unused template structs
cb188e862c1c wifi: ath10k: use flexible array in struct wmi_tdls_peer_capabilities
6b9923f1f6d1 wifi: ath10k: remove duplicate memset() in 10.4 TDLS peer update

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20231213-wmi_host_mem_chunks_flexarray-v1-1-92922d92fa2c@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches