Hi,
Your fix of the ALSA memory allocation problem is incorrect. This only fixes the
problem with the commerical USB Audio driver. It does not fix for all drivers. The
proper fix is to replace the function setup_pcm_id with this one (note the added
"card->number << 24"):
============================================================================================
/*
* set up the unique pcm id
*/
static inline void setup_pcm_id(snd_pcm_substream_t *subs)
{
if (! subs->dma_device.id)
subs->dma_device.id = subs->pcm->card->number << 24 |
subs->pcm->device << 16 |
subs->stream << 8 | (subs->number + 1);
}
============================================================================================
Thanks,
Loc Ho
Index: alsa-kernel/usb/usbaudio.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/usb/usbaudio.c,v
retrieving revision 1.100
diff -u -r1.100 usbaudio.c
--- alsa-kernel/usb/usbaudio.c 7 May 2004 10:08:49 -0000 1.100
+++ alsa-kernel/usb/usbaudio.c 13 May 2004 18:05:45 -0000
@@ -2036,6 +2036,7 @@
static void init_substream(snd_usb_stream_t *as, int stream, struct audioformat *fp)
{
snd_usb_substream_t *subs = &as->substream[stream];
+ snd_pcm_substream_t *pcms;
INIT_LIST_HEAD(&subs->fmt_list);
spin_lock_init(&subs->lock);
@@ -2047,7 +2048,12 @@
subs->ops = audio_urb_ops[stream];
else
subs->ops = audio_urb_ops_high_speed[stream];
- snd_pcm_lib_preallocate_pages(as->pcm->streams[stream].substream,
+ /* set up the unique device id with the card index number */
+ pcms = as->pcm->streams[stream].substream;
+ pcms->dma_device.id = (as->pcm->device << 16) |
+ (pcms->stream << 8) | (pcms->number + 1) |
+ (as->chip->card->number + 1) << 24;
+ snd_pcm_lib_preallocate_pages(pcms,
SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
64 * 1024, 128 * 1024);
--Multipart_Thu_May_13_20:06:45_2004-1--
--__--__--
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