linux-kernel - [PATCH 3.16 43/47] caif-hsi: fix possible deadlock in cfhsi_exit

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Message-ID: <lsq.1572026582.278792420@decadent.org.uk>
Date:   Fri, 25 Oct 2019 19:03:44 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Taehee Yoo" <ap420073@...il.com>
Subject: [PATCH 3.16 43/47] caif-hsi: fix possible deadlock in
 cfhsi_exit_module()

3.16.76-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Taehee Yoo <ap420073@...il.com>

commit fdd258d49e88a9e0b49ef04a506a796f1c768a8e upstream.

cfhsi_exit_module() calls unregister_netdev() under rtnl_lock().
but unregister_netdev() internally calls rtnl_lock().
So deadlock would occur.

Fixes: c41254006377 ("caif-hsi: Add rtnl support")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/caif/caif_hsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/caif/caif_hsi.c
+++ b/drivers/net/caif/caif_hsi.c
@@ -1467,7 +1467,7 @@ static void __exit cfhsi_exit_module(voi
 	rtnl_lock();
 	list_for_each_safe(list_node, n, &cfhsi_list) {
 		cfhsi = list_entry(list_node, struct cfhsi, list);
-		unregister_netdev(cfhsi->ndev);
+		unregister_netdevice(cfhsi->ndev);
 	}
 	rtnl_unlock();
 }