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authorMika Westerberg <mika.westerberg@linux.intel.com>2013-09-02 13:30:25 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-09-02 12:59:40 +0200
commitaf65cfe9aeae03e0682bebdf4db94582d75562dd (patch)
tree197c7560e4510c4712a8ae3dddc283705a88f8c9 /drivers/acpi
parent524f42fab787a9510be826ce3d736b56d454ac6d (diff)
downloadop-kernel-dev-af65cfe9aeae03e0682bebdf4db94582d75562dd.zip
op-kernel-dev-af65cfe9aeae03e0682bebdf4db94582d75562dd.tar.gz
ACPI / LPSS: don't crash if a device has no MMIO resources
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> Cc: 3.10+ <stable@vger.kernel.org> # 3.10+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/acpi_lpss.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 6a38218..fb78bb9 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -257,12 +257,13 @@ 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) {
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