linux-kernel - Re: [PATCH] staging: rtl8723bs: Use list iterators and helpers

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Date:   Mon, 7 Jun 2021 04:26:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Fabio Aiuto <fabioaiuto83@...il.com>, gregkh@...uxfoundation.org,
        hdegoede@...hat.com, Larry.Finger@...inger.net,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723bs: Use list iterators and helpers

On Mon, Jun 07, 2021 at 02:17:04PM +0300, Dan Carpenter wrote:
> On Fri, Jun 04, 2021 at 05:54:22PM -0700, Guenter Roeck wrote:
> > On Fri, Jun 04, 2021 at 07:26:33PM +0200, Fabio Aiuto wrote:
> > > Hello Guenter,
> > > 
> > > On Wed, Apr 28, 2021 at 10:33:01AM -0700, Guenter Roeck wrote:
> > > > The rtl8723bs driver manually re-implements list helper functions
> > > > and macros in various ways. Replace with existing list helpers.
> > > 
> > > I'm testing rtl8723bs on a baytrail tablet (Lenovo Ideapad MIIX 300-10IBY)
> > > and applying the tag staging-5.13-rc4, loading r8723bs makes the whole
> > > system freezing while trying to connect to local AP.
> > > 
> > > Only a power off is allowed.
> > > 
> > > I found that commit b3cd518c5abd42fbc747ef55a5fdc40bf7bf01c0
> > > (staging: rtl8723bs: Use list iterators and helpers)
> > > introduced the bug.
> > > 
> > > I'm trying to find out what's wrong with this patch, have you any suggestions?
> > 
> > Some of the iterators needed the _safe variant which I didn't take into account.
> > I thought that was fixed, but maybe some locations were missed.
> 
> Ah...  Crud.  As near as I can tell Martin fixed a lot of these in the driver
> he is working on, rtl8188eu.  But they still aren't fixed in rtl8723bs.  I looked
> at the functions and the following loops need to changed to list_for_each_safe().
> (Doing a search for list_del_init() helped during review).
> 

Hans wants the patch introducing the problem reverted, so I won't bother
sending a fix. Sorry for the trouble. Learned a lesson (I hope).

Guenter

> expire_timeout_chk() (both loops)
> rtw_acl_remove_sta()
> rtw_sta_flush()
> stop_ap_mode()
> 
> rtw_free_network_queue()
> chk_bmc_sleepq_hdl()
> rtw_free_all_stainfo()
> rtw_free_xmitframe_queue()
> dequeue_xmitframes_to_sleeping_queue()
> wakeup_sta_to_xmit()  (both loops)
> xmit_delivery_enabled_frames()
> 
> xmit_xmitframes()
> cfg80211_rtw_del_station()
> 
> regards,
> dan carpenter
> 
>