netdev - [PATCH net] net/smc: use GFP_ATOMIC allocation in smc_pnet_add

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Message-Id: <20220206143348.350693-1-eric.dumazet@gmail.com>
Date:   Sun,  6 Feb 2022 06:33:48 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net] net/smc: use GFP_ATOMIC allocation in smc_pnet_add_eth()

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

My last patch moved the netdev_tracker_alloc() call to a section
protected by a write_lock().

I should have replaced GFP_KERNEL with GFP_ATOMIC to avoid the infamous:

BUG: sleeping function called from invalid context at include/linux/sched/mm.h:256

Fixes: 28f922213886 ("net/smc: fix ref_tracker issue in smc_pnet_add()")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/smc/smc_pnet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
index fb6331d97185a5db9b4539e7f081e9fa469bc44b..0599246c037690b4b01813956e4af74519277bea 100644
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -382,7 +382,7 @@ static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net,
 		if (ndev) {
 			new_pe->ndev = ndev;
 			netdev_tracker_alloc(ndev, &new_pe->dev_tracker,
-					     GFP_KERNEL);
+					     GFP_ATOMIC);
 		}
 		list_add_tail(&new_pe->list, &pnettable->pnetlist);
 		write_unlock(&pnettable->lock);
-- 
2.35.0.263.gb82422642f-goog