From ffc26918ab5674b286a4bc07dac7e011cea83e97 Mon Sep 17 00:00:00 2001 From: Frank Mandarino Date: Mon, 8 Jan 2007 10:58:47 +0100 Subject: [PATCH] [ALSA] ASoC at91 - Fix NULL pointer dereference in at91_i2s_shutdown This patch fixes a NULL pointer exception which occurs when a substream is opened and immediately closed. Signed-off-by: Frank Mandarino Signed-off-by: Liam Girdwood Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/soc/at91/at91-i2s.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sound/soc/at91/at91-i2s.c b/sound/soc/at91/at91-i2s.c index 203e6948cd99..876d391c7013 100644 --- a/sound/soc/at91/at91-i2s.c +++ b/sound/soc/at91/at91-i2s.c @@ -296,6 +296,13 @@ static int at91_i2s_startup(struct snd_pcm_substream *substream) ssc_p->dir_mask |= dir_mask; spin_unlock_irq(&ssc_p->lock); + /* + * dma_data is not set until hw_params() is called and + * shutdown() depends on this value being NULL if hw_params() + * was not called. + */ + rtd->cpu_dai->dma_data = NULL; + return 0; } -- 2.20.1