netdev - Re: [PATCH] cw1200: remove an unneeded NULL check on list iterator

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Date:   Sun, 20 Mar 2022 09:53:02 +0800
From:   Xiaomeng Tong <xiam0nd.tong@...il.com>
To:     jakobkoschel@...il.com
Cc:     davem@...emloft.net, kuba@...nel.org, kvalo@...nel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, pizza@...ftnet.org, xiam0nd.tong@...il.com
Subject: Re: [PATCH] cw1200: remove an unneeded NULL check on list iterator

On Sun, 20 Mar 2022 01:47:26 +0100, Jakob Koschel
<jakobkoschel@...il.com> wrote:  
> I don't think this is fixing anything here. You are basically just removing
> a check that was always true.

Yes.

> 
> I'm pretty sure that this check is here to check if either the list is empty or no
> element was found. If I'm not wrong, some time ago, lists where not circular but
> actually pointed to NULL (or the head was NULL) so this check made sense but doesn't
> anymore.
> 
> The appropriate fix would be only setting 'item' when a break is hit and keep
> the original check.

You are right if that is the author's original intention. I will fix it in PATCH v2.

> 
> > 			unsigned long tmo = item->queue_timestamp + queue->ttl;
> > 			mod_timer(&queue->gc, tmo);
> > 			cw1200_pm_stay_awake(&stats->priv->pm_state,
> > -- 
> > 2.17.1
> > 
> > 
> 
> I've made those changes already and I'm in the process of upstreaming them in an organized
> way, so maybe it would make sense to synchronize, so we don't post duplicate patches.

Ok, I will cc you when sending related patches to avoid duplication.
I hope you can do the same, thank you.

Here are the 9 patches I have sent, so you don't have to reinvent th wheel:
https://lore.kernel.org/all/20220319102222.3079-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319073143.30184-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319063800.28791-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319053742.27443-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319052350.26535-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319044416.24242-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319043606.23292-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220319042657.21835-1-xiam0nd.tong@gmail.com/
https://lore.kernel.org/all/20220316075153.3708-1-xiam0nd.tong@gmail.com/

--
Xiaomeng Tong