Re: [PATCH v1 1/1] dmaengine: acpi: Free resource list at appropriate time

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Wed, Jun 17, 2026 at 04:52:09PM -0400, Frank Li wrote:
> On Wed, Jun 17, 2026 at 11:14:21AM +0200, Andy Shevchenko wrote:
> > In one case we don't free resources when formally should, and
> > in the other we do unneeded "double free" (emptying an empty
> > list).
> >
> > Both are not critical issues at all, they just make code robust
> > against any possible future changes in the flow.
> 
> what are you talking about, can use straight forward words.
> 
> You just move acpi_dev_free_resource_list() after check return value
> of acpi_dev_get_resources().

Not really. There are _two_ cases. And while they are slightly different,
the solution is to make them behave in the same ways.

...

> >  	INIT_LIST_HEAD(&resource_list);
> >  	ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> > -	if (ret <= 0)
> > +	if (ret < 0)
> >  		return 0;
> 
> Dose this change related with this patch?

Yes. It's mentioned in the very first part of the first sentence in the commit
message.

> >
> >  	list_for_each_entry(rentry, &resource_list, node) {
> > @@ -370,10 +370,11 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
> >  	INIT_LIST_HEAD(&resource_list);
> >  	ret = acpi_dev_get_resources(adev, &resource_list,
> >  				     acpi_dma_parse_fixed_dma, &pdata);
> > -	acpi_dev_free_resource_list(&resource_list);
> >  	if (ret < 0)
> >  		return ERR_PTR(ret);
> >
> > +	acpi_dev_free_resource_list(&resource_list);
> > +
> >  	if (dma_spec->slave_id < 0 || dma_spec->chan_id < 0)
> >  		return ERR_PTR(-ENODEV);
> >
> > --
> > 2.50.1
> >

-- 
With Best Regards,
Andy Shevchenko