From: Javier Martin Date: Thu, 12 Jan 2012 11:30:38 +0000 (+0100) Subject: ASoC: Fix DMA channel leak in imx-pcm-dma-mx2 driver. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=220d9f259536e22afef30347b7b42148640282a7;p=linux-beck.git ASoC: Fix DMA channel leak in imx-pcm-dma-mx2 driver. "snd_imx_pcm_hw_params" callback can be called several times by the user (i.e. OSS emulation) leading to a DMA channel leak. Signed-off-by: Javier Martin Signed-off-by: Mark Brown --- diff --git a/sound/soc/imx/imx-pcm-dma-mx2.c b/sound/soc/imx/imx-pcm-dma-mx2.c index 1cf2fe889f6a..7d7fbb5d2a91 100644 --- a/sound/soc/imx/imx-pcm-dma-mx2.c +++ b/sound/soc/imx/imx-pcm-dma-mx2.c @@ -88,11 +88,13 @@ static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream, iprtd->dma_data.dma_request = dma_params->dma; /* Try to grab a DMA channel */ - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - iprtd->dma_chan = dma_request_channel(mask, filter, iprtd); - if (!iprtd->dma_chan) - return -EINVAL; + if (!iprtd->dma_chan) { + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + iprtd->dma_chan = dma_request_channel(mask, filter, iprtd); + if (!iprtd->dma_chan) + return -EINVAL; + } switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: