linux-kernel - Re: [PATCH v1] mac80211_hwsim: add concurrent channels scanning support over virtio

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Date:   Thu, 06 May 2021 23:13:36 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Weilun Du <wdu@...gle.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kernel-team@...roid.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] mac80211_hwsim: add concurrent channels scanning
 support over virtio

On Thu, 2021-05-06 at 14:11 -0700, Weilun Du wrote:
> On Thu, May 6, 2021 at 11:19 AM Johannes Berg <johannes@...solutions.net> wrote:
> > 
> > On Thu, 2021-05-06 at 11:05 -0700, Weilun Du wrote:
> > > This fixed the crash when setting channels to 2 or more when
> > > communicating over virtio.
> > 
> > Interesting, I thought I was probably the only user of virtio? :)
> > 
> > johannes
> > 
> Hi Johannes,
> Actually, Android Emulator uses mac80211_hwsim for wifi simulation
> over virtio and it's working. This patch fixed the crash when we set
> channels=2 to speed up scanning. I am trying to see if it makes sense
> to upstream this patch since it's not Android-specific. Thanks!
> 
Oh sure, I'll take a look and will probably apply it for the next cycle,
haven't done an in-depth review. I was just surprised somebody actually
*used* the virtio thing :-)

Does that mean virt_wifi isn't used anymore by the Android emulator?
Maybe then we should remove that again, it had some obscure bugs that
syzkaller found? Not that I mind it being around much, but ...

johannes