netdev - [PATCH net] sfc: fix addr_list_lock spinlock use before init

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Message-ID: <alpine.LFD.2.03.1409161654370.25290@solarflare.com>
Date:	Tue, 16 Sep 2014 16:57:59 +0100
From:	Edward Cree <ecree@...arflare.com>
To:	Edward Cree <ecree@...arflare.com>
CC:	Nikolay Aleksandrov <nikolay@...hat.com>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, Ben Hutchings <ben@...adent.org.uk>,
	Shradha Shah <sshah@...arflare.com>,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>
Subject: [PATCH net] sfc: fix addr_list_lock spinlock use before init

Reported by Nikolay Aleksandrov.  In efx_init_port() we call
 efx_mac_reconfigure() to work around a Falcon/A1 limitation, and this calls
 efx_{arch}_filter_sync_rx_mode(), which takes the addr_list_lock; but this
 lock is uninitialised, because we haven't called register_netdevice() yet.
So, in efx_farch_filter_sync_rx_mode(), check efx_dev_registered() before
 doing anything else.
The EF10 equivalent, efx_ef10_filter_sync_rx_mode(), already has the
 corresponding check.
---
 drivers/net/ethernet/sfc/farch.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/sfc/farch.c b/drivers/net/ethernet/sfc/farch.c
index 0537381..6859437 100644
--- a/drivers/net/ethernet/sfc/farch.c
+++ b/drivers/net/ethernet/sfc/farch.c
@@ -2933,6 +2933,9 @@ void efx_farch_filter_sync_rx_mode(struct efx_nic *efx)
 	u32 crc;
 	int bit;
 
+	if (!efx_dev_registered(efx))
+		return;
+
 	netif_addr_lock_bh(net_dev);
 
 	efx->unicast_filter = !(net_dev->flags & IFF_PROMISC);
-- 
1.7.11.7
--
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