linux-kernel - Re: [PATCH hyperv-fixes,v3] hv_netvsc: Fix unwanted wakeup after tx

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Date:   Fri, 29 Mar 2019 13:34:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     haiyangz@...uxonhyperv.com
Cc:     sashal@...nel.org, linux-hyperv@...r.kernel.org,
        haiyangz@...rosoft.com, kys@...rosoft.com, sthemmin@...rosoft.com,
        olaf@...fle.de, vkuznets@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH hyperv-fixes,v3] hv_netvsc: Fix unwanted wakeup after
 tx_disable

From: Haiyang Zhang <haiyangz@...uxonhyperv.com>
Date: Thu, 28 Mar 2019 19:40:36 +0000

> From: Haiyang Zhang <haiyangz@...rosoft.com>
> 
> After queue stopped, the wakeup mechanism may wake it up again
> when ring buffer usage is lower than a threshold. This may cause
> send path panic on NULL pointer when we stopped all tx queues in
> netvsc_detach and start removing the netvsc device.
> 
> This patch fix it by adding a tx_disable flag to prevent unwanted
> queue wakeup.
> 
> Fixes: 7b2ee50c0cd5 ("hv_netvsc: common detach logic")
> Reported-by: Mohammed Gamal <mgamal@...hat.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>

Applied and queued up for -stable, thanks.