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authorClemens Ladisch <clemens@ladisch.de>2009-10-21 09:09:38 +0200
committerTakashi Iwai <tiwai@suse.de>2009-11-10 16:20:43 +0100
commit8579d2d7779d7ff41ea2a0183015e0e5038f1043 (patch)
treea194af444f11846d078ca3fb87bdb61f5188464e /sound/core
parentdede17b8e931eeaa38b0288e8d545d558d904942 (diff)
sound: rawmidi: fix double init when opening MIDI device with O_APPEND
Commit 9a1b64caac82aa02cb74587ffc798e6f42c6170a in 2.6.30 moved the substream initialization code to where it would be executed every time the substream is opened. This had the consequence that any further opening would drop and leak the data in the existing buffer, and that the device driver's open callback would be called multiple times, unexpectedly. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/rawmidi.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index c0adc14c91f0..3071e6f5801e 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -266,17 +266,19 @@ static int open_substream(struct snd_rawmidi *rmidi,
{
int err;
- err = snd_rawmidi_runtime_create(substream);
- if (err < 0)
- return err;
- err = substream->ops->open(substream);
- if (err < 0)
- return err;
- substream->opened = 1;
- if (substream->use_count++ == 0)
+ if (substream->use_count == 0) {
+ err = snd_rawmidi_runtime_create(substream);
+ if (err < 0)
+ return err;
+ err = substream->ops->open(substream);
+ if (err < 0)
+ return err;
+ substream->opened = 1;
substream->active_sensing = 0;
- if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
- substream->append = 1;
+ if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
+ substream->append = 1;
+ }
+ substream->use_count++;
rmidi->streams[substream->stream].substream_opened++;
return 0;
}