diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-06-27 12:53:37 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-10-31 14:48:47 +0000 |
| commit | c9bd5e690a439df044678d89e89e380cf9db7930 (patch) | |
| tree | e2f73839b2be962bd4b4f19279aafa38e7b72332 /sound/soc/kirkwood/kirkwood-dma.c | |
| parent | fa6a8d6d65b19ab44e5244ea499bcd553cc72343 (diff) | |
| download | lwn-c9bd5e690a439df044678d89e89e380cf9db7930.tar.gz lwn-c9bd5e690a439df044678d89e89e380cf9db7930.zip | |
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/kirkwood/kirkwood-dma.c')
| -rw-r--r-- | sound/soc/kirkwood/kirkwood-dma.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c index b238434f92b0..3814bb037485 100644 --- a/sound/soc/kirkwood/kirkwood-dma.c +++ b/sound/soc/kirkwood/kirkwood-dma.c @@ -59,8 +59,6 @@ static struct snd_pcm_hardware kirkwood_dma_snd_hw = { .fifo_size = 0, }; -static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32); - static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) { struct kirkwood_dma_data *priv = dev_id; @@ -292,10 +290,9 @@ static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) struct snd_pcm *pcm = rtd->pcm; int ret; - if (!card->dev->dma_mask) - card->dev->dma_mask = &kirkwood_dma_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) { ret = kirkwood_dma_preallocate_dma_buffer(pcm, |