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authorClemens Ladisch <clemens@ladisch.de>2009-10-21 03:09:38 -0400
committerTakashi Iwai <tiwai@suse.de>2009-11-10 10:20:43 -0500
commit8579d2d7779d7ff41ea2a0183015e0e5038f1043 (patch)
treea194af444f11846d078ca3fb87bdb61f5188464e /sound
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')
-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,
266{ 266{
267 int err; 267 int err;
268 268
269 err = snd_rawmidi_runtime_create(substream); 269 if (substream->use_count == 0) {
270 if (err < 0) 270 err = snd_rawmidi_runtime_create(substream);
271 return err; 271 if (err < 0)
272 err = substream->ops->open(substream); 272 return err;
273 if (err < 0) 273 err = substream->ops->open(substream);
274 return err; 274 if (err < 0)
275 substream->opened = 1; 275 return err;
276 if (substream->use_count++ == 0) 276 substream->opened = 1;
277 substream->active_sensing = 0; 277 substream->active_sensing = 0;
278 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 278 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
279 substream->append = 1; 279 substream->append = 1;
280 }
281 substream->use_count++;
280 rmidi->streams[substream->stream].substream_opened++; 282 rmidi->streams[substream->stream].substream_opened++;
281 return 0; 283 return 0;
282} 284}