[PATCH] libata-acpi: Try and stop all the non PCI devices crashing

For 2.6.20 it mostly used to just not work, for 2.6.21-rc it crashes, this
seems to be down to luck (bad or good). The libata-acpi code needs to
avoid doing PCI work on non-PCI devices. This is one hack although it's
not pretty and perhaps there is a "right" way to check if a struct device
* is PCI ?

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/ata/libata-acpi.c

@@ -34,6 +34,13 @@ struct taskfile_array {
 	u8	tfa[REGS_PER_GTF];	/* regs. 0x1f1 - 0x1f7 */
 };
 
+/*
+ *	Helper - belongs in the PCI layer somewhere eventually
+ */
+static int is_pci_dev(struct device *dev)
+{
+	return (dev->bus == &pci_bus_type);
+}
 
 /**
  * sata_get_dev_handle - finds acpi_handle and PCI device.function
@@ -53,6 +60,9 @@ static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
 	struct pci_dev	*pci_dev;
 	acpi_integer	addr;
 
+	if (!is_pci_dev(dev))
+		return -ENODEV;
+
 	pci_dev = to_pci_dev(dev);	/* NOTE: PCI-specific */
 	/* Please refer to the ACPI spec for the syntax of _ADR. */
 	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
@@ -84,7 +94,12 @@ static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
 	acpi_status status;
 	struct acpi_device_info	*dinfo = NULL;
 	int ret = -ENODEV;
-	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_dev *pdev;
+
+	if (!is_pci_dev(dev))
+		return -ENODEV;
+
+	pdev = to_pci_dev(dev);
 
 	bus = pdev->bus->number;
 	devnum = PCI_SLOT(pdev->devfn);