From: Edward Cree <ecree@solarflare.com>
Date: Tue, 16 Sep 2014 16:05:21 +0000 (+0100)
Subject: sfc: fix addr_list_lock spinlock use before init
X-Git-Tag: fixes-for-v3.18-merge-window~87^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f650fb456f2079b762c131a11397c0a966e2bfe4;p=pandora-kernel.git

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.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Tested-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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