Re: [PATCH] net: stmmac: Move debugfs init/exit to ->probe()/->remove()

Jose Abreu
2018-11-23T12:44:11Z

On 23-11-2018 12:21, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
>
> Setting up and tearing down debugfs is current unbalanced, as seen by
> this error during resume from suspend:
>
> [ 752.134067] dwc-eth-dwmac 2490000.ethernet eth0: ERROR failed to create debugfs directory
> [ 752.134347] dwc-eth-dwmac 2490000.ethernet eth0: stmmac_hw_setup: failed debugFS registration
>
> The imbalance happens because the driver creates the debugfs hierarchy
> when the device is opened and tears it down when the device is closed.
> There's little gain in that, and it could be argued that it is even
> surprising because it's not usually done for other devices. Fix the
> imbalance by moving the debugfs creation and teardown to the driver's
> ->probe() and ->remove() implementations instead.
>
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>

Did you test trying to dump "descriptors_status" file when
interface is not open ? I think that's the main reason why this
is not in probe ...

Thanks and Best Regards,
Jose Miguel Abreu