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

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Date:	Tue, 16 Sep 2014 16:05:56 +0100
From:	Edward Cree <ecree@...arflare.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
CC:	<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: Re: [PATCH net] sfc: fix addr_list_lock spinlock use before init

On Mon, 15 Sep 2014, Nikolay Aleksandrov wrote:
> When the module is initializing the ports it may call a function that
> uses addr_list_lock before register_netdevice() has been called for that
> port i.e. addr_list_lock is still uninitialized. The function in
> question is efx_farch_filter_sync_rx_mode(), now it looks pointless to call
> it before the port has been registered so alter the reconfigure_mac
> callbacks to check if the port has been registered using the existing
> efx_dev_registered() macro.

Weak NAK as this should really be done in efx_farch_filter_sync_rx_mode() 
rather than its callers.  In fact it seems our out-of-tree driver has done 
this for a while but we forgot to upstream it, though curiously we did 
upstream the corresponding fix for EF10.
Will follow up with a patch after sanity testing it.

--
-Edward Cree
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