netdev - [PATCH net v3 1/4] octeon_ep: fix race conditions in ndo_get

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Message-ID: <20241218115111.2407958-2-srasheed@marvell.com>
Date: Wed, 18 Dec 2024 03:51:08 -0800
From: Shinas Rasheed <srasheed@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <hgani@...vell.com>, <sedara@...vell.com>, <vimleshk@...vell.com>,
        <thaller@...hat.com>, <wizhao@...hat.com>, <kheib@...hat.com>,
        <konguyen@...hat.com>, <horms@...nel.org>, <einstein.xue@...axg.com>,
        "Shinas
 Rasheed" <srasheed@...vell.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        Andrew Lunn <andrew+netdev@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        "Paolo
 Abeni" <pabeni@...hat.com>,
        Satananda Burla <sburla@...vell.com>,
        "Abhijit
 Ayarekar" <aayarekar@...vell.com>
Subject: [PATCH net v3 1/4] octeon_ep: fix race conditions in ndo_get_stats64

ndo_get_stats64() can race with ndo_stop(), which frees input and
output queue resources. Call synchronize_net() to avoid such races.

Fixes: 6a610a46bad1 ("octeon_ep: add support for ndo ops")
Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
V3: 
  - No changes 

V2: https://lore.kernel.org/all/20241216075842.2394606-2-srasheed@marvell.com/
  - Changed sync mechanism to fix race conditions from using an atomic
    set_bit ops to a much simpler synchronize_net()

V1: https://lore.kernel.org/all/20241203072130.2316913-2-srasheed@marvell.com/

 drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 1 +
 1 file changed, 1 insertion(+)

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");
 
 	octep_ctrl_net_set_link_status(oct, OCTEP_CTRL_NET_INVALID_VFID, false,
-- 
2.25.1