netdev - Re: [PATCH net] vlan: also check phy_driver ts

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Message-ID: <20180330152121.rmvdkjrqmhekasnh@localhost>
Date:   Fri, 30 Mar 2018 08:21:21 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] vlan: also check phy_driver ts_info for vlan's real
 device

On Fri, Mar 30, 2018 at 05:02:14PM +0200, Andrew Lunn wrote:
> Would it not be better to just call ethtool_get_ts_info() on the real
> device? That would then also deal with the case that the 'real' device
> is another virtual device stacked on top of a real device.

That won't work.

The returned 'ethtool_ts_info' is on the stack of
ethtool_get_ts_info().  Both the top level and the inner call to
will call copy_to_user(), but the top level will clobber the correct
result with zeros.

Thanks,
Richard