Hi Andy,
Thank you for the review.
On Sat, Dec 25, 2021 at 4:59 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Sat, Dec 25, 2021 at 4:06 AM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> wrote:
> >
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypasses the hierarchical setup and messes up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq() for DT users only.
> >
> > While at it propagate error code in case request_irq() fails instead of
> > returning -EBUSY.
>
>
> > + if (dev_of_node(&priv->pdev->dev)) {
>
> Why?! What's wrong with using the same approach in all cases?
>
The earlier code looped the resource from start to end and then
requested the resources. So I believed the the IORESOURCE_IRQ was
sending the range of interrupts. But now looking at the mach-davinci
folder I can confirm its just send an single IRQ resource. So this
check can be dropped and same approach can be used for OF and non OF
users.
> > + while ((ret = platform_get_irq_optional(priv->pdev, res_num)) != -ENXIO) {
>
> This is wrong.
>
> You need to check better as I pointed several times against your patches.
>
Right, Ill have a look.
Cheers,
Prabhakar
> > + if (ret < 0)
> > + goto rollback;
> >
> > + ret = request_irq(ret, emac_irq, 0, ndev->name, ndev);
> > + if (ret) {
> > + dev_err(emac_dev, "DaVinci EMAC: request_irq() failed\n");
> > goto rollback;
> > }
> > + res_num++;
> > }
> > - res_num++;
> > + } else {
> > + while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, res_num))) {
> > + for (irq_num = res->start; irq_num <= res->end; irq_num++) {
> > + ret = request_irq(irq_num, emac_irq, 0, ndev->name, ndev);
> > + if (ret) {
> > + dev_err(emac_dev, "DaVinci EMAC: request_irq() failed\n");
> > + goto rollback;
> > + }
> > + }
> > + res_num++;
> > + }
> > + /* prepare counters for rollback in case of an error */
> > + res_num--;
> > + irq_num--;
> > }
>
> --
> With Best Regards,
> Andy Shevchenko
