linux-kernel - [PATCH] ASoC: dwc: disallow building designware

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Date:   Tue, 18 Apr 2017 12:59:54 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, Jose Abreu <Jose.Abreu@...opsys.com>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH] ASoC: dwc: disallow building designware_pcm as a module

It makes not sense: the whether the PIO PCM extension is used is
hardcoded to the designware_i2s driver and designware_pcm doesn't
have any module metadata, causing a kernel taint:

  [   44.287000] designware_pcm: module license 'unspecified' taints kernel.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 sound/soc/dwc/Kconfig                                     | 4 ++--
 sound/soc/dwc/Makefile                                    | 6 +++++-
 sound/soc/dwc/{designware_i2s.c => designware_i2s_main.c} | 2 +-
 sound/soc/dwc/{designware_pcm.c => designware_i2s_pcm.c}  | 2 +-
 4 files changed, 9 insertions(+), 5 deletions(-)
 rename sound/soc/dwc/{designware_i2s.c => designware_i2s_main.c} (99%)
 rename sound/soc/dwc/{designware_pcm.c => designware_i2s_pcm.c} (99%)

diff --git a/sound/soc/dwc/Kconfig b/sound/soc/dwc/Kconfig
index c297efe..704b7b2 100644
--- a/sound/soc/dwc/Kconfig
+++ b/sound/soc/dwc/Kconfig
@@ -8,10 +8,10 @@ config SND_DESIGNWARE_I2S
 	 maximum of 8 channels each for play and record.
 
 config SND_DESIGNWARE_PCM
-	tristate "PCM PIO extension for I2S driver"
+	bool "PCM PIO extension for I2S driver"
 	depends on SND_DESIGNWARE_I2S
 	help
-	 Say Y, M or N if you want to add a custom ALSA extension that registers
+	 Say Y if you want to add a custom ALSA extension that registers
 	 a PCM and uses PIO to transfer data.
 
 	 This functionality is specially suited for I2S devices that don't have
diff --git a/sound/soc/dwc/Makefile b/sound/soc/dwc/Makefile
index 38f1ca3..05c594f 100644
--- a/sound/soc/dwc/Makefile
+++ b/sound/soc/dwc/Makefile
@@ -1,5 +1,9 @@
 # SYNOPSYS Platform Support
+
 obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_i2s.o
+
+designware_i2s-objs := designware_i2s_main.o
+
 ifdef CONFIG_SND_DESIGNWARE_PCM
-obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_pcm.o
+designware_i2s-objs += designware_i2s_pcm.o
 endif
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s_main.c
similarity index 99%
rename from sound/soc/dwc/designware_i2s.c
rename to sound/soc/dwc/designware_i2s_main.c
index bdf8398..23c2212 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s_main.c
@@ -1,7 +1,7 @@
 /*
  * ALSA SoC Synopsys I2S Audio Layer
  *
- * sound/soc/dwc/designware_i2s.c
+ * sound/soc/dwc/designware_i2s_main.c
  *
  * Copyright (C) 2010 ST Microelectronics
  * Rajeev Kumar <rajeevkumar.linux@...il.com>
diff --git a/sound/soc/dwc/designware_pcm.c b/sound/soc/dwc/designware_i2s_pcm.c
similarity index 99%
rename from sound/soc/dwc/designware_pcm.c
rename to sound/soc/dwc/designware_i2s_pcm.c
index 4a83a22..27664e2 100644
--- a/sound/soc/dwc/designware_pcm.c
+++ b/sound/soc/dwc/designware_i2s_pcm.c
@@ -1,7 +1,7 @@
 /*
  * ALSA SoC Synopsys PIO PCM for I2S driver
  *
- * sound/soc/dwc/designware_pcm.c
+ * sound/soc/dwc/designware_i2s_pcm.c
  *
  * Copyright (C) 2016 Synopsys
  * Jose Abreu <joabreu@...opsys.com>
-- 
2.9.3