Re: [PATCH v11 3/7] PCI: dwc: Handle MSIs routed to multiple GIC interrupts

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On 23/05/2022 18:32, Johan Hovold wrote:
On Mon, May 23, 2022 at 06:17:19PM +0300, Dmitry Baryshkov wrote:
On 23/05/2022 17:02, Johan Hovold wrote:
On Mon, May 23, 2022 at 04:39:56PM +0300, Dmitry Baryshkov wrote:
On 23/05/2022 10:53, Johan Hovold wrote:
On Fri, May 20, 2022 at 09:31:10PM +0300, Dmitry Baryshkov wrote:

+static int dw_pcie_parse_split_msi_irq(struct pcie_port *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct device *dev = pci->dev;
+	struct platform_device *pdev = to_platform_device(dev);
+	int irq;
+	u32 ctrl;
+
+	irq = platform_get_irq_byname_optional(pdev, split_msi_names[0]);
+	if (irq == -ENXIO)
+		return -ENXIO;

You still need to check for other errors and -EPROBE_DEFER here.

I think even the if (irq < 0) return irq; will work here.

No need to print errors unless -EPROBEDEFER as you do below?

There is no separate print for the dw_pcie_parse_split_msi_irq() errors.

I don't understand what you're referring to here.

My question is: Why would you not be printing error messages for msi0 as
you are for msi1..msi7 in the loop below.

Yeah, this seems like a correct idea. Thank you!


+
+	pp->msi_irq[0] = irq;
+
+	/* Parse as many IRQs as described in the DTS. */

s/DTS/devicetree/

+	for (ctrl = 1; ctrl < MAX_MSI_CTRLS; ctrl++) {
+		irq = platform_get_irq_byname_optional(pdev, split_msi_names[ctrl]);
+		if (irq == -ENXIO)
+			break;
+		if (irq < 0)
+			return dev_err_probe(dev, irq,
+					     "Failed to parse MSI IRQ '%s'\n",
+					     split_msi_names[ctrl]);
+
+		pp->msi_irq[ctrl] = irq;
+	}
+
+	pp->num_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL;
+
+	return 0;
+}

Johan


--
With best wishes
Dmitry



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