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sound: rawmidi: fix checking of O_APPEND when opening MIDI device

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Commit 9a1b64caac in 2.6.30 dropped the
check that a substream must already have been opened with O_APPEND to be
able to open it a second time.

This would make it possible for a substream to be switched to append
mode, which would mean that non-atomic writes would fail unexpectedly.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-10-21 09:10:16 +02:00 committed by Takashi Iwai
parent 8579d2d777
commit 16fb109644
1 changed files with 2 additions and 1 deletions
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3
sound/core/rawmidi.c
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@ -248,7 +248,8 @@ static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
list_for_each_entry(substream, &s->substreams, list) {
if (substream->opened) {
if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
!(mode & SNDRV_RAWMIDI_LFLG_APPEND))
!(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
!substream->append)
continue;
}
if (subdevice < 0 || subdevice == substream->number) {