Re: USX2Y 2.6.20-rt2 Oops on disconnect

[Takashi Iwai <tiwai@suse.de>]

At Mon, 5 Feb 2007 23:27:06 +0100,
Karsten Wiese wrote:
> 
> Hi Takashi,
> 
> had some oopses here running -rt kernels,
> which vanished after applying this.

It wasn't included in 2.6.20, so likely this may be the cause.

You can also try either the latest alsa-driver from HG tree or the
alsa.git mm branch, both of which include this fix.


Takashi


> 
>       Karsten
> ------------------------------------------------------------------- 
> snd_hwdep_release() racefix
> 
> 
> snd_card_file_remove() can free the snd_card.
> Touch hw->* only before calling snd_card_file_remove().
> 
> Unrelated: Allow hwdep devices not to have own ops.release();
> 
> 
> Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
> 
> 
> --- /alsa-kernel/core/hwdep.c_	2007-01-30 20:32:01.000000000 +0100
> +++ /alsa-kernel/core/hwdep.c	2007-01-30 20:32:01.000000000 +0100
> @@ -156,15 +156,16 @@
>  	int err = -ENXIO;
>  	struct snd_hwdep *hw = file->private_data;
>  	struct module *mod = hw->card->module;
> +
>  	mutex_lock(&hw->open_mutex);
> -	if (hw->ops.release) {
> +	if (hw->ops.release)
>  		err = hw->ops.release(hw, file);
> -		wake_up(&hw->open_wait);
> -	}
>  	if (hw->used > 0)
>  		hw->used--;
> -	snd_card_file_remove(hw->card, file);
>  	mutex_unlock(&hw->open_mutex);
> +	wake_up(&hw->open_wait);
> +
> +	snd_card_file_remove(hw->card, file);
>  	module_put(mod);
>  	return err;
>  }

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642