This is a note to let you know that I've just added the patch titled
ACPI / PNP: Fix acpi_pnp_match()
to the 3.15-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-pnp-fix-acpi_pnp_match.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b6328a07bd6b3d31b64f85864fe74f3b08c010ca Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Date: Wed, 30 Jul 2014 00:23:09 +0200
Subject: ACPI / PNP: Fix acpi_pnp_match()
From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
commit b6328a07bd6b3d31b64f85864fe74f3b08c010ca upstream.
The acpi_pnp_match() function is used for finding the ACPI device
object that should be associated with the given PNP device.
Unfortunately, the check used by that function is not strict enough
and may cause success to be returned for a wrong ACPI device object.
To fix that, use the observation that the pointer to the ACPI
device object in question is already stored in the data field
in struct pnp_dev, so acpi_pnp_match() can simply use that
field to do its job.
This problem was uncovered in 3.14 by commit 202317a573b2 (ACPI / scan:
Add acpi_device objects for all device nodes in the namespace).
Fixes: 202317a573b2 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Reported-and-tested-by: Vinson Lee <vlee@xxxxxxxxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pnp/pnpacpi/core.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -339,8 +339,7 @@ static int __init acpi_pnp_match(struct
struct pnp_dev *pnp = _pnp;
/* true means it matched */
- return !acpi->physical_node_count
- && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
+ return pnp->data == acpi;
}
static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
Patches currently in stable-queue which might be from rafael.j.wysocki@xxxxxxxxx are
queue-3.15/acpi-pnp-fix-acpi_pnp_match.patch
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