The driver may sleep under a spin lock, and the function call path is: midi_outc (acquire the lock by spin_lock_irqsave) oss_broken_sleep_on schedule_timeout --> may sleep

To fix it, the lock is released before oss_broken_sleep_on, and the lock is acquired again after this function.

Signed-off-by: Jia-Ju Bai baijiaju1990@163.com --- sound/oss/sequencer.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/sound/oss/sequencer.c b/sound/oss/sequencer.c index f19da4b..3d95d752 100644 --- a/sound/oss/sequencer.c +++ b/sound/oss/sequencer.c @@ -1211,7 +1211,9 @@ static void midi_outc(int dev, unsigned char data)

spin_lock_irqsave(&lock,flags); while (n && !midi_devs[dev]->outputc(dev, data)) { + spin_unlock_irqrestore(&lock, flags); oss_broken_sleep_on(&seq_sleeper, HZ/25); + spin_lock_irqsave(&lock, flags); n--; } spin_unlock_irqrestore(&lock,flags);