netdev - [PATCH 4/4] net: wwan: iosm: fix recursive lock acquire in unregister

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Date:   Wed,  4 Aug 2021 21:39:52 +0530
From:   M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        krishna.c.sudi@...el.com, linuxwwan@...el.com
Subject: [PATCH 4/4] net: wwan: iosm: fix recursive lock acquire in unregister

Calling unregister_netdevice() inside wwan del link is trying to
acquire the held lock in ndo_stop_cb(). Instead, queue net dev to
be unregistered later.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
---
 drivers/net/wwan/iosm/iosm_ipc_wwan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.c b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
index b2357ad5d517..b571d9cedba4 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_wwan.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
@@ -228,7 +228,7 @@ static void ipc_wwan_dellink(void *ctxt, struct net_device *dev,
 
 	RCU_INIT_POINTER(ipc_wwan->sub_netlist[if_id], NULL);
 	/* unregistering includes synchronize_net() */
-	unregister_netdevice(dev);
+	unregister_netdevice_queue(dev, head);
 
 unlock:
 	mutex_unlock(&ipc_wwan->if_mutex);
-- 
2.25.1