linux-kernel - RE: [PATCH 04/11] hv_netvsc: Disable NAPI before closing the VMBus channel

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Message-ID: <DM5PR2101MB1047792102EAE9C52D4ED5E9D7DE0@DM5PR2101MB1047.namprd21.prod.outlook.com>
Date:   Fri, 10 Apr 2020 19:20:16 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Boqun Feng <boqun.feng@...il.com>,
        vkuznets <vkuznets@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 04/11] hv_netvsc: Disable NAPI before closing the VMBus
 channel

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Sunday, April 5, 2020 5:15 PM
> 
> vmbus_chan_sched() might call the netvsc driver callback function that
> ends up scheduling NAPI work.  This "work" can access the channel ring
> buffer, so we must ensure that any such work is completed and that the
> ring buffer is no longer being accessed before freeing the ring buffer
> data structure in the channel closure path.  To this end, disable NAPI
> before calling vmbus_close() in netvsc_device_remove().
> 
> Suggested-by: Michael Kelley <mikelley@...rosoft.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> Acked-by: Stephen Hemminger <stephen@...workplumber.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: <netdev@...r.kernel.org>
> ---
>  drivers/hv/channel.c        | 6 ++++++
>  drivers/net/hyperv/netvsc.c | 7 +++++--
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>