linux-kernel - Re: [PATCH] wifi: plfxlc: remove assert for mac->lock

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Message-ID: <tencent_48A8AECCEEC30C8EE7C8C6F692C2064D4906@qq.com>
Date: Tue, 30 Jul 2024 19:46:50 +0800
From: Edward Adam Davis <eadavis@...com>
To: kvalo@...nel.org
Cc: eadavis@...com,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	srini.raju@...elifi.com,
	syzbot+51a42f7c2e399392ea82@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] wifi: plfxlc: remove assert for mac->lock

On Tue, 30 Jul 2024 13:35:07 +0300, Kalle Valo wrote:
> > syzbot report WARNING in plfxlc_mac_release, according to the context,
> > there is not need assert for mac->lock.
> 
> The commit message should explain _why_ the assert is not needed.
> Otherwise it looks that you are randomly removing it to get rid of the
> warning.
mac->lock is used to protect mac data, but after calling plfxlc_mac_release(), 
there are two functions:ieee80211_unregister_hw() and ieee80211_free_hw(),
there is no action to operate on mac data in these two functions, so mac->lock
is not required.

On the other hand, there is no holding action for mac->lock before calling plfxlc_mac_release.

--
Edward