This is a note to let you know that I've just added the patch titled
ACPI / LPSS: don't crash if a device has no MMIO resources
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-lpss-don-t-crash-if-a-device-has-no-mmio-resources.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From af65cfe9aeae03e0682bebdf4db94582d75562dd Mon Sep 17 00:00:00 2001
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Date: Mon, 2 Sep 2013 13:30:25 +0300
Subject: ACPI / LPSS: don't crash if a device has no MMIO resources
From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/acpi_lpss.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -257,12 +257,13 @@ static int acpi_lpss_create_device(struc
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) {
Patches currently in stable-queue which might be from mika.westerberg@xxxxxxxxxxxxxxx are
queue-3.11/acpi-lpss-don-t-crash-if-a-device-has-no-mmio-resources.patch
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