On Mon, 2007-02-05 at 16:40 -0500, Jason Baron wrote:

hi,

I just ran into a RHEL4 U5 beta kernel oops in snd_hda_input_mux_info(), 
because the 'imux' parameter pointer was NULL. I traced this back to 
stac92xx_parse_auto_config(), which can return 0, if 'line_outs' is not 
set, without having initialized the 'input_mux'.

The oops does not happen on the upstream kernel on this hardware b/c 
'line_outs' was set (additional code has been added since RHEL4 to set 
it). However, it still appears to me, that if 'line_outs' is not set, we 
should return an error code, and not 0.

thanks,

-Jason

Try this patch to see if it works with your alsa version. It's a simple patch that adds the error condition, and should be able to be applied to older alsa versions.

Summary: add error for undetected line_outs.

This adds an error condition to stac92xx_parse_auto_config if line_outs is less than zero.

Signed off by Tobin Davis <tdavis@dsl-only.net>