Re: [PATCH v2 5/6] net: dsa: add missing calls in dsa_switch_destroy
From: Andrew Lunn
Date: Thu Oct 29 2015 - 10:01:15 EST
On Thu, Oct 29, 2015 at 02:23:25PM +0100, Neil Armstrong wrote:
> Add missing netif_carrier_off and phy_disconnect calls to the
> dsa_switch_destroy function to make sure the netdev and phy
> ressources are clean before complete removal.
> Signed-off-by: Frode Isaksen <fisaksen@xxxxxxxxxxxx>
> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> net/dsa/dsa.c | 2 ++
> 1 file changed, 2 insertions(+)
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 597a462..11452e4 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -454,7 +454,9 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
> if (!ds->ports[port])
> + netif_carrier_off(ds->ports[port]);
> + phy_disconnect(p->phy);
Once you make it actually compile....
I'm not sure this is safe. The loop above this one has just destroyed
some phys, and now you are potentially disconnecting a phy you just
destroyed, causing it to be accessed?
I would suggest you first fix the ordering in dsa_switch_destroy()
and then add the missing netif_carrier_off() and phy_disconnect().
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