fix: Newer kernels: msi_desc not active

jerzyjamroz · jerzyjamroz · commit ed3d9831a098 · 2025-08-22T13:08:40.000+02:00
diff --git a/linux/pci_generic_msi.c b/linux/pci_generic_msi.c
@@ -170,9 +170,15 @@ static int probe_generic_msi(struct pci_dev *pdev,
     }
 
     {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)
         struct msi_desc *desc = irq_get_msi_desc(pdev->irq);
         priv->maskable = desc ? desc->msi_attrib.maskbit : 0;
         dev_info(&pdev->dev, "MSI is %smaskable\n", priv->maskable ? "" : "not ");
+#else
+        // Newer kernels: msi_desc not active
+        priv->maskable = 0;
+        dev_info(&pdev->dev, "MSI enabled (mask-bit introspection not available).\n");
+#endif
     }
 
     err = uio_register_device(&pdev->dev, &priv->uio);

Original file line number	Diff line number	Diff line change
`@@ -170,9 +170,15 @@ static int probe_generic_msi(struct pci_dev *pdev,`
`170`	`170`	`}`
`171`	`171`
`172`	`172`	`{`
	`173`	`+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)`
`173`	`174`	`struct msi_desc *desc = irq_get_msi_desc(pdev->irq);`
`174`	`175`	`priv->maskable = desc ? desc->msi_attrib.maskbit : 0;`
`175`	`176`	`dev_info(&pdev->dev, "MSI is %smaskable\n", priv->maskable ? "" : "not ");`
	`177`	`+#else`
	`178`	`+ // Newer kernels: msi_desc not active`
	`179`	`+ priv->maskable = 0;`
	`180`	`+ dev_info(&pdev->dev, "MSI enabled (mask-bit introspection not available).\n");`
	`181`	`+#endif`
`176`	`182`	`}`
`177`	`183`
`178`	`184`	`err = uio_register_device(&pdev->dev, &priv->uio);`