[alsa-devel] Why is substream->pcm->dev == NULL?

Timur Tabi timur at freescale.com
Thu Aug 7 20:51:55 CEST 2008

In my _pointer callback function, I have this:

printk(KERN_INFO "%s:%u substream->pcm->dev=%p, substream->pcm->card->dev=%p\n",
__func__, __LINE__, substream->pcm->dev, substream->pcm->card->dev);

During playback, it displays this:

fsl_dma_pointer:698 substream->pcm->dev=00000000, substream->pcm->card->dev=dfa50a08

Why is substream->pcm->dev == NULL?  What's the point of having this field if
you're not going to use it?

Timur Tabi
Linux kernel developer at Freescale

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