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@xxxxxxxxxxxxxxxxxxxxx>
>
>
> --- /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;
> }
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