ACPI / LPSS: don't crash if a device has no MMIO resources

commit af65cfe9aeae03e0682bebdf4db94582d75562dd upstream.

Intel LPSS devices that are enumerated from ACPI have both MMIO and IRQ
resources returned in their _CRS method. However, Apple Macbook Air with
Haswell has LPSS devices enumerated from PCI bus instead and _CRS method
returns only an interrupt number (but the device has _HID set that causes
the scan handler to match it).

The current ACPI / LPSS code sets pdata->dev_desc only when MMIO resource
is found for the device and in case of Macbook Air it is never found. That
leads to a NULL pointer dereference in register_device_clock().

Correct this by always setting the pdata->dev_desc.

Reported-and-tested-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index cab13f2fc28e3033aaed24adbbf618199473bb28..7c451cb26254f6158f8c87f7fcacda91ccce4c56 100644 (file)
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -155,12 +155,13 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
                        pdata->mmio_size = resource_size(&rentry->res);
                        pdata->mmio_base = ioremap(rentry->res.start,
                                                   pdata->mmio_size);
-                       pdata->dev_desc = dev_desc;
                        break;
                }
 
        acpi_dev_free_resource_list(&resource_list);
 
+       pdata->dev_desc = dev_desc;
+
        if (dev_desc->clk_required) {
                ret = register_device_clock(adev, pdata);
                if (ret) {