netdev - Re: [PATCH net] net: fix __netdev_update_features return on ndo_set

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Date:	Tue, 17 Nov 2015 14:54:18 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Nikolay Aleksandrov <razor@...ckwall.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH net] net: fix __netdev_update_features return on
 ndo_set_features failure

On Fri, Nov 13, 2015 at 03:20:24PM +0100, Nikolay Aleksandrov wrote:
> From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> 
> If ndo_set_features fails __netdev_update_features() will return -1 but
> this is wrong because it is expected to return 0 if no features were
> changed (see netdev_update_features()), which will cause a netdev
> notifier to be called without any actual changes. Fix this by returning
> 0 if ndo_set_features fails.

Hmm. In case ndo_update_features() failed it might have changed the features.
The assumption I made was that we're better off initiating spurious notification
than miss one. This is an unlikely event - a bug in a driver or problem with the HW.

Best Regards,
Michał Mirosław
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