linux-kernel - Re: Re: [PATCH] sfc: Check null pointer of rx_queue->page

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Date:   Mon, 20 Dec 2021 22:51:34 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     ecree.xilinx@...il.com, habetsm.xilinx@...il.com,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: Re: [PATCH] sfc: Check null pointer of rx_queue->page_ring

On Mon, Dec 20, 2021 at 10:16:28PM +0800, Greg KH wrote:
> Why not return an error?

Because I have received the mail from Martin Habets that telling me
it doesn't need to return error code.
Here is the mail.
https://lore.kernel.org/lkml/20211219092948.t2iprptmyfrzgthb@gmail.com/
On Sun, Dec 19, 2021 at 05:29:48PM +0800, Martin Habets wrote:
> Your predicate is wrong. The code that uses rx_queue->page_ring
> can deal with it being NULL.
> The only thing you might want to do is set rx_queue->page_ptr_mask
> to 0.

Jiasheng