Messages in this thread | | | Date | Fri, 30 Nov 2018 13:16:48 -0800 (PST) | Subject | Re: [PATCH v2] net: stmmac: Move debugfs init/exit to ->probe()/->remove() | From | David Miller <> |
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From: Thierry Reding <thierry.reding@gmail.com> Date: Tue, 27 Nov 2018 14:21:43 +0100
> 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. > > Note that the ring descriptors cannot be read while the interface is > down, so make sure to return an empty file when the descriptors_status > debugfs file is read. > > Signed-off-by: Thierry Reding <treding@nvidia.com> > --- > This applies on top of net-next. > > Changes in v2: > - avoid access to ring descriptors when interface is down
Applied, thanks.
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