linux-kernel - [PATCH 4.0 04/60] ACPI / PNP: add two IDs to list for PNPACPI device enumeration

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Date:	Fri, 15 May 2015 16:14:05 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Witold Szczeponik <Witold.Szczeponik@....net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.0 04/60] ACPI / PNP: add two IDs to list for PNPACPI device enumeration

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Witold Szczeponik <Witold.Szczeponik@....net>

commit 622532bb2fad8fe342fb685727ae0be566f6be5d upstream.

Commit eec15edbb0e1 (ACPI / PNP: use device ID list for PNPACPI device
enumeration) changed the way how ACPI devices are enumerated and when
they are added to the PNP bus.

However, it broke the sound card support on (at least) a vintage
IBM ThinkPad 600E: with said commit applied, two of the necessary
"CSC01xx" devices are not added to the PNP bus and hence can not be
found during the initialization of the "snd-cs4236" module.  As a
consequence, loading "snd-cs4236" causes null pointer exceptions.
The attached patch fixes the problem end re-enables sound on the
IBM ThinkPad 600E.

Fixes: eec15edbb0e1 (ACPI / PNP: use device ID list for PNPACPI device enumeration)
Signed-off-by: Witold Szczeponik <Witold.Szczeponik@....net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/acpi_pnp.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/acpi/acpi_pnp.c
+++ b/drivers/acpi/acpi_pnp.c
@@ -304,6 +304,8 @@ static const struct acpi_device_id acpi_
 	{"PNPb006"},
 	/* cs423x-pnpbios */
 	{"CSC0100"},
+	{"CSC0103"},
+	{"CSC0110"},
 	{"CSC0000"},
 	{"GIM0100"},		/* Guillemot Turtlebeach something appears to be cs4232 compatible */
 	/* es18xx-pnpbios */

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