From 8579d2d7779d7ff41ea2a0183015e0e5038f1043 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Wed, 21 Oct 2009 09:09:38 +0200 Subject: 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 Cc: Signed-off-by: Takashi Iwai diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index c0adc14..3071e6f 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; } -- cgit v0.10.2