[PATCH] acpi: Build CONFIG_SOUND=m build failure in CONFIG_THINKPAD_ACPI

[Ingo Molnar]

-tip testing found that commit 0d204c34e85d1d63e5fdd3e3192747daf0ee7ec1
("thinkpad-acpi: basic ALSA mixer support (v2)") from today's upstream
kernel causes the following build failure on x86, for
CONFIG_THINKPAD_ACPI=y && CONFIG_SOUND=m:

  drivers/built-in.o: In function `volume_alsa_notify_change':
  thinkpad_acpi.c:(.text+0x2d5c2d): undefined reference to `snd_ctl_notify'
  thinkpad_acpi.c:(.text+0x2d5c47): undefined reference to `snd_ctl_notify'

This build fails because thinkpad_acpi.c uses sound facilities
unconditionally, without expressing its dependency on the sound
subsystem.

Add a Kconfig dependency on SOUND to remedy this.

Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
Cc: Lorne Applebaum <lorne.applebaum@xxxxxxxxx>
Cc: Matthew Garrett <mjg@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 drivers/platform/x86/Kconfig |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index f8bec62..dbd4ef1 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -216,6 +216,7 @@ config THINKPAD_ACPI
 	depends on ACPI
 	depends on INPUT
 	depends on RFKILL || RFKILL = n
+	depends on SND
 	select BACKLIGHT_LCD_SUPPORT
 	select BACKLIGHT_CLASS_DEVICE
 	select HWMON
--
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