[alsa-devel] Getting pcm_usb_stream plugin to know its limits. [Kind of SOLVED]

Michaël Cadilhac michael at cadilhac.name
Tue Feb 2 06:24:22 CET 2010

Takashi Iwai <tiwai at suse.de> writes:

> At Mon, 11 Jan 2010 13:35:19 -0500,
> Michaël Cadilhac wrote:
>> michael at cadilhac.name (Michaël Cadilhac) writes:
>> > michael at cadilhac.name (Michaël Cadilhac) writes:
>> >
>> >> So, my final saying is the following patch.  It fixes the segfault on
>> >> stopping a non-started usb_stream, plus it adds the ability to set a
>> >> period size and sound rate.  The latter offers a workaround for the
>> >> second issue I came with (that the default values for period bytes, and
>> >> hence period size, were too high for us122l to work).
>> >
>> > Any comment on that patch would be greatly appreciated.  I'm just
>> > wondering if it's safe for me to give it to some people.
>> Anyone?  Note that this also fixes a real bug, so it might be of
>> interest to include it in the trunk.
> Through a quick glance, the patch looks OK to me.
> Could you give a proper subject and changelog to merge your patch
> to git tree?

Hi there Takashi, and sorry for the delay.  Here are the patch,
subdivised in two distinct logical changes.  I hope the format is what
you asked for.

	* usb_stream/pcm_usb_stream.c (snd_pcm_us_stop): Prevent
	dereferencing when structure is not initialized.

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  I can write the according documentation, if needed.

  Have a great day.

Michaël `Micha' Cadilhac (LITQ, U. de Montréal) -- http://michael.cadilhac.name
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