On Fri, Apr 10, 2020 at 11:49:18PM +0300, Dmitry Osipenko wrote:
> 09.04.2020 20:52, Thierry Reding пишет:
> ...
> > +int tegra210_clk_emc_attach(struct clk *clk,
> > +			    struct tegra210_clk_emc_provider *provider)
> > +{
> > +	struct clk_hw *hw = __clk_get_hw(clk);
> > +	struct tegra210_clk_emc *emc = to_tegra210_clk_emc(hw);
> > +	struct device *dev = provider->dev;
> > +	unsigned int i;
> > +	int err;
> > +
> > +	if (!try_module_get(provider->owner))
> > +		return -ENODEV;
> 
> Is the EMC driver module bumping its own refcount by itself?

Hm... this doesn't really look useful in retrospect. Yes, the EMC is
effectively grabbing a reference to itself.

> In the other patch I already suggested that the EMC module should be
> disallowed to be unloaded once it has been loaded, seems you're already
> doing it. Correct?

Interestingly, it all seems to work fine if I unload the module at
runtime, not sure why I'm not prevented from unloading the module.

Thierry