linux-kernel - [PATCH 4.14 07/99] ipvlan: do not use cond_resched_rcu() in ipvlan_process

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Date:   Thu, 19 Mar 2020 14:02:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 07/99] ipvlan: do not use cond_resched_rcu() in ipvlan_process_multicast()

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit afe207d80a61e4d6e7cfa0611a4af46d0ba95628 ]

Commit e18b353f102e ("ipvlan: add cond_resched_rcu() while
processing muticast backlog") added a cond_resched_rcu() in a loop
using rcu protection to iterate over slaves.

This is breaking rcu rules, so lets instead use cond_resched()
at a point we can reschedule

Fixes: e18b353f102e ("ipvlan: add cond_resched_rcu() while processing muticast backlog")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Mahesh Bandewar <maheshb@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ipvlan/ipvlan_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ipvlan/ipvlan_core.c
+++ b/drivers/net/ipvlan/ipvlan_core.c
@@ -240,7 +240,6 @@ void ipvlan_process_multicast(struct wor
 			}
 			ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
 			local_bh_enable();
-			cond_resched_rcu();
 		}
 		rcu_read_unlock();
 
@@ -257,6 +256,7 @@ void ipvlan_process_multicast(struct wor
 		}
 		if (dev)
 			dev_put(dev);
+		cond_resched();
 	}
 }