diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-06-27 11:53:37 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-31 14:48:47 (GMT) |
| commit | c9bd5e690a439df044678d89e89e380cf9db7930 (patch) | |
| tree | e2f73839b2be962bd4b4f19279aafa38e7b72332 /sound/soc/atmel | |
| parent | fa6a8d6d65b19ab44e5244ea499bcd553cc72343 (diff) | |
| download | linux-c9bd5e690a439df044678d89e89e380cf9db7930.tar.xz | |
DMA-API: sound: fix dma mask handling in a lot of drivers
This code sequence is unsafe in modules:
static u64 mask = DMA_BIT_MASK(something);
...
if (!dev->dma_mask)
dev->dma_mask = &mask;
as if a module is reloaded, the mask will be pointing at the original
module's mask address, and this can lead to oopses. Moreover, they
all follow this with:
if (!dev->coherent_dma_mask)
dev->coherent_dma_mask = mask;
where 'mask' is the same value as the statically defined mask, and this
bypasses the architecture's check on whether the DMA mask is possible.
Fix these issues by using the new dma_coerce_coherent_and_mask()
function.
Acked-by: Mark Brown <broonie@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'sound/soc/atmel')
| -rw-r--r-- | sound/soc/atmel/atmel-pcm.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/sound/soc/atmel/atmel-pcm.c b/sound/soc/atmel/atmel-pcm.c index 3109db7..fbb87e3 100644 --- a/sound/soc/atmel/atmel-pcm.c +++ b/sound/soc/atmel/atmel-pcm.c @@ -68,18 +68,15 @@ int atmel_pcm_mmap(struct snd_pcm_substream *substream, } EXPORT_SYMBOL_GPL(atmel_pcm_mmap); -static u64 atmel_pcm_dmamask = DMA_BIT_MASK(32); - int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; struct snd_pcm *pcm = rtd->pcm; - int ret = 0; + int ret; - if (!card->dev->dma_mask) - card->dev->dma_mask = &atmel_pcm_dmamask; - if (!card->dev->coherent_dma_mask) - card->dev->coherent_dma_mask = DMA_BIT_MASK(32); + ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n"); |