linux-kernel - [patch] build fix for sound/drivers/pcsp/pcsp.c

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Date:	Sun, 4 May 2008 19:37:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stas Sergeev <stsp@...et.ru>, Takashi Iwai <tiwai@...e.de>
Subject: [patch] build fix for sound/drivers/pcsp/pcsp.c

x86.git testing found the following build error in v2.6.26-rc1:

  sound/drivers/pcsp/pcsp.c: In function 'pcsp_suspend':
  sound/drivers/pcsp/pcsp.c:201: error: implicit declaration of function 'snd_pcm_suspend_all'

with the following config:

  http://redhat.com/~mingo/misc/config-Sun_May__4_19_20_01_CEST_2008.bad

the reason is the .suspend callback - which is defined even in the case 
of !CONFIG_PM in which case snd_pcm_suspend_all() is not available. 
Undefine the method for that case, like other platform drivers do.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 sound/drivers/pcsp/pcsp.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/sound/drivers/pcsp/pcsp.c
===================================================================
--- linux.orig/sound/drivers/pcsp/pcsp.c
+++ linux/sound/drivers/pcsp/pcsp.c
@@ -194,6 +194,7 @@ static void pcsp_stop_beep(struct snd_pc
 	spin_unlock_irq(&chip->substream_lock);
 }
 
+#ifdef CONFIG_PM
 static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
 {
 	struct snd_pcsp *chip = platform_get_drvdata(dev);
@@ -201,6 +202,7 @@ static int pcsp_suspend(struct platform_
 	snd_pcm_suspend_all(chip->pcm);
 	return 0;
 }
+#endif
 
 static void pcsp_shutdown(struct platform_device *dev)
 {
@@ -215,7 +217,9 @@ static struct platform_driver pcsp_platf
 	},
 	.probe		= pcsp_probe,
 	.remove		= __devexit_p(pcsp_remove),
+#ifdef CONFIG_PM
 	.suspend	= pcsp_suspend,
+#endif
 	.shutdown	= pcsp_shutdown,
 };
 
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