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authorTakashi Iwai <tiwai@suse.de>2012-06-08 11:01:37 +0400
committerTakashi Iwai <tiwai@suse.de>2012-06-08 11:01:37 +0400
commit8260ef075bd9848ce6a8004ec73b7454d410cc15 (patch)
tree75326710f5eab5902d898899bfd9209646979ea7 /sound/usb/stream.c
parent69c5b7530651c8e375d2fbecd157a9a9a20c4cc9 (diff)
downloadlinux-8260ef075bd9848ce6a8004ec73b7454d410cc15.tar.xz
ALSA: usb-audio: Fix substream assignments
In 3.5 kernel, the endpoint is assigned dynamically for the substreams, but the PCM assignment still checks the presence of the endpoint pointer. This ended up in duplicated PCM substream creations at probing time, resulting in kernel warnings like: WARNING: at fs/proc/generic.c:586 proc_register+0x169/0x1a6() Pid: 1152, comm: modprobe Not tainted 3.5.0-rc1-00110-g71fae7e #2 Call Trace: [<ffffffff8102a400>] warn_slowpath_common+0x83/0x9c [<ffffffff8102a4bc>] warn_slowpath_fmt+0x46/0x48 [<ffffffff813829ad>] ? add_preempt_count+0x39/0x3b [<ffffffff811292f0>] proc_register+0x169/0x1a6 [<ffffffff8112962e>] create_proc_entry+0x74/0x8c [<ffffffffa018eb63>] snd_info_register+0x3e/0xc3 [snd] [<ffffffffa01fde2e>] snd_pcm_new_stream+0xb1/0x404 [snd_pcm] [<ffffffffa024861f>] snd_usb_add_audio_stream+0xd2/0x230 [snd_usb_audio] [<ffffffffa0241d33>] ? snd_usb_parse_audio_format+0x252/0x34f [snd_usb_audio] [<ffffffff810d6b17>] ? kmem_cache_alloc_trace+0xab/0xbb [<ffffffffa0248c29>] snd_usb_parse_audio_interface+0x4ac/0x567 [snd_usb_audio] [<ffffffffa023f0ff>] snd_usb_create_stream+0xe9/0x125 [snd_usb_audio] [<ffffffffa023f9b1>] usb_audio_probe+0x62a/0x72c [snd_usb_audio] ..... This patch fixes the regression by checking the fixed endpoint number for each substream instead of the endpoint pointer. Reported-and-tested-by: Jamie Heilman <jamie@audible.transient.net> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/stream.c')
-rw-r--r--sound/usb/stream.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 6b7d7a2b7baa..083ed81160e5 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -97,6 +97,7 @@ static void snd_usb_init_substream(struct snd_usb_stream *as,
subs->formats |= fp->formats;
subs->num_formats++;
subs->fmt_type = fp->fmt_type;
+ subs->ep_num = fp->endpoint;
}
/*
@@ -119,9 +120,7 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
- if (!subs->data_endpoint)
- continue;
- if (subs->data_endpoint->ep_num == fp->endpoint) {
+ if (subs->ep_num == fp->endpoint) {
list_add_tail(&fp->list, &subs->fmt_list);
subs->num_formats++;
subs->formats |= fp->formats;
@@ -134,7 +133,7 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
- if (subs->data_endpoint)
+ if (subs->ep_num)
continue;
err = snd_pcm_new_stream(as->pcm, stream, 1);
if (err < 0)