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ALSA: seq: Fix link corruption by event error handling

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am: 003aa34372

Change-Id: I5c14157cc11ff09f45950d0b9a58dcc2c22535d4
This commit is contained in:
Takashi Iwai 2017-03-12 08:14:11 +00:00 • committed by android-build-merger
commit cc787f23a2
1 changed files with 3 additions and 0 deletions
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3
sound/core/seq/seq_fifo.c
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@ -135,6 +135,7 @@ int snd_seq_fifo_event_in(struct snd_seq_fifo *f,
f->tail = cell; f->tail = cell;
if (f->head == NULL) if (f->head == NULL)
f->head = cell; f->head = cell;
cell->next = NULL;
f->cells++; f->cells++;
spin_unlock_irqrestore(&f->lock, flags); spin_unlock_irqrestore(&f->lock, flags);
@ -214,6 +215,8 @@ void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f,
spin_lock_irqsave(&f->lock, flags); spin_lock_irqsave(&f->lock, flags);
cell->next = f->head; cell->next = f->head;
f->head = cell; f->head = cell;
if (!f->tail)
f->tail = cell;
f->cells++; f->cells++;
spin_unlock_irqrestore(&f->lock, flags); spin_unlock_irqrestore(&f->lock, flags);
} }