| Message ID | 20211224192626.15843-9-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: Use platform_get_irq*() variants to fetch IRQ's | expand |
On Sat, Dec 25, 2021 at 4:06 AM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> 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? > + 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. > + 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--; > }
Hi Andy, Thank you for the review. On Sat, Dec 25, 2021 at 4:59 PM Andy Shevchenko <andy.shevchenko@gmail.com> wrote: > > On Sat, Dec 25, 2021 at 4:06 AM Lad Prabhakar > <prabhakar.mahadev-lad.rj@bp.renesas.com> 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
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c index d55f06120ce7..31df3267a01a 100644 --- a/drivers/net/ethernet/ti/davinci_emac.c +++ b/drivers/net/ethernet/ti/davinci_emac.c @@ -1454,23 +1454,33 @@ static int emac_dev_open(struct net_device *ndev) } /* Request IRQ */ - while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, - res_num))) { - for (irq_num = res->start; irq_num <= res->end; irq_num++) { - if (request_irq(irq_num, emac_irq, 0, ndev->name, - ndev)) { - dev_err(emac_dev, - "DaVinci EMAC: request_irq() failed\n"); - ret = -EBUSY; + if (dev_of_node(&priv->pdev->dev)) { + while ((ret = platform_get_irq_optional(priv->pdev, res_num)) != -ENXIO) { + 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--; } - /* prepare counters for rollback in case of an error */ - res_num--; - irq_num--; /* Start/Enable EMAC hardware */ emac_hw_enable(priv); @@ -1554,16 +1564,24 @@ static int emac_dev_open(struct net_device *ndev) napi_disable(&priv->napi); rollback: - for (q = res_num; q >= 0; q--) { - res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, q); - /* at the first iteration, irq_num is already set to the - * right value - */ - if (q != res_num) - irq_num = res->end; + if (dev_of_node(&priv->pdev->dev)) { + for (q = res_num - 1; q >= 0; q--) { + irq_num = platform_get_irq(priv->pdev, q); + if (irq_num > 0) + free_irq(irq_num, ndev); + } + } else { + for (q = res_num; q >= 0; q--) { + res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, q); + /* at the first iteration, irq_num is already set to the + * right value + */ + if (q != res_num) + irq_num = res->end; - for (m = irq_num; m >= res->start; m--) - free_irq(m, ndev); + for (m = irq_num; m >= res->start; m--) + free_irq(m, ndev); + } } cpdma_ctlr_stop(priv->dma); pm_runtime_put(&priv->pdev->dev); @@ -1899,13 +1917,10 @@ static int davinci_emac_probe(struct platform_device *pdev) goto err_free_txchan; } - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res) { - dev_err(&pdev->dev, "error getting irq res\n"); - rc = -ENOENT; + rc = platform_get_irq(pdev, 0); + if (rc < 0) goto err_free_rxchan; - } - ndev->irq = res->start; + ndev->irq = rc; rc = davinci_emac_try_get_mac(pdev, res_ctrl ? 0 : 1, priv->mac_addr); if (!rc)
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. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> --- drivers/net/ethernet/ti/davinci_emac.c | 69 ++++++++++++++++---------- 1 file changed, 42 insertions(+), 27 deletions(-)