[alsa-devel] pcm->private_data is NULL in alsa core!!

Clemens Ladisch cladisch at fastmail.net
Tue Jun 19 16:29:38 CEST 2007

Pharaoh . wrote:
> in register codec 4 pvt data is c3d81180
> Registering the sound card
> in register codec 5 pvt data is c3998f20
> i.e. after registering the sound card the value changes/gets
> corrupted, and c3998f20
> is not the value I get everytime, so I am thinking it is corrrupted somehow.

I'd guess the memory gets overwritten.

> But back in probe, after above function are executed, i.e. after
> register codec is over, I get the correct value for
> eac->pcm->private_data i.e. c3d81180, but by now the value of
> pcm->private_data is corrupted!

This implies that eac->pcm != pcm.

It seems quite a lot of memory gets corrupted.
Try to check which one of the various "eac" and "pcm" pointers changes
its value.


More information about the Alsa-devel mailing list