[PATCH 12/61] ALSA: Fix bug in snd-usb-usx2ys usX2Y_pcms_lock_check()

[Chris Wright]

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

From: Karsten Wiese <annabellesgarden@xxxxxxxx>

[PATCH] ALSA: Fix bug in snd-usb-usx2y's usX2Y_pcms_lock_check()

Fix bug in snd-usb-usx2y's usX2Y_pcms_lock_check()

substream can be NULL......
in mainline, bug was introduced by:
2006-06-22  [ALSA] Add O_APPEND flag support to PCM

From: Karsten Wiese <annabellesgarden@xxxxxxxx>
Signed-off-by: Karsten Wiese <annabellesgarden@xxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 sound/usb/usx2y/usx2yhwdeppcm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.18.1.orig/sound/usb/usx2y/usx2yhwdeppcm.c
+++ linux-2.6.18.1/sound/usb/usx2y/usx2yhwdeppcm.c
@@ -632,7 +632,7 @@ static int usX2Y_pcms_lock_check(struct 
 		for (s = 0; s < 2; ++s) {
 			struct snd_pcm_substream *substream;
 			substream = pcm->streams[s].substream;
-			if (SUBSTREAM_BUSY(substream))
+			if (substream && SUBSTREAM_BUSY(substream))
 				err = -EBUSY;
 		}
 	}

--
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