From: Jakub Kicinski <kuba@kernel.org>
To: Shinas Rasheed <srasheed@marvell.com>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<hgani@marvell.com>, <sedara@marvell.com>, <vimleshk@marvell.com>,
<thaller@redhat.com>, <wizhao@redhat.com>, <kheib@redhat.com>,
<konguyen@redhat.com>, <horms@kernel.org>,
<einstein.xue@synaxg.com>,
Veerasenareddy Burru <vburru@marvell.com>,
Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
Satananda Burla <sburla@marvell.com>,
"Abhijit Ayarekar" <aayarekar@marvell.com>
Subject: Re: [PATCH net v3 1/4] octeon_ep: fix race conditions in ndo_get_stats64
Date: Thu, 19 Dec 2024 19:21:23 -0800 [thread overview]
Message-ID: <20241219192123.4a5f6e75@kernel.org> (raw)
In-Reply-To: <20241218115111.2407958-2-srasheed@marvell.com>
On Wed, 18 Dec 2024 03:51:08 -0800 Shinas Rasheed wrote:
> ndo_get_stats64() can race with ndo_stop(), which frees input and
> output queue resources. Call synchronize_net() to avoid such races.
synchronize_rcu() acts as a barrier.
What are the two operations you are separating with this barrier?
> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> index 549436efc204..941bbaaa67b5 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> @@ -757,6 +757,7 @@ static int octep_stop(struct net_device *netdev)
> {
> struct octep_device *oct = netdev_priv(netdev);
>
> + synchronize_net();
> netdev_info(netdev, "Stopping the device ...\n");
next prev parent reply other threads:[~2024-12-20 3:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-18 11:51 [PATCH net v3 0/4] Fix race conditions in ndo_get_stats64 Shinas Rasheed
2024-12-18 11:51 ` [PATCH net v3 1/4] octeon_ep: fix " Shinas Rasheed
2024-12-20 3:21 ` Jakub Kicinski [this message]
2024-12-18 11:51 ` [PATCH net v3 2/4] octeon_ep: remove firmware stats fetch " Shinas Rasheed
2024-12-20 3:23 ` Jakub Kicinski
2024-12-18 11:51 ` [PATCH net v3 3/4] octeon_ep_vf: fix race conditions " Shinas Rasheed
2024-12-20 3:21 ` Jakub Kicinski
2024-12-18 11:51 ` [PATCH net v3 4/4] octeon_ep_vf: remove firmware stats fetch " Shinas Rasheed
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