From b5fd12d6c0fc64c2c2b5ae095e63824083d27151 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 15 Apr 2019 09:03:01 +0200 Subject: ALSA: seq: Correct unlock sequence at snd_seq_client_ioctl_unlock() The doubly unlock sequence at snd_seq_client_ioctl_unlock() is tricky. I took a direct unref call since I thought it would avoid misunderstanding, but rather this seems more confusing. Let's use snd_seq_client_unlock() consistently even if they look strange to be called twice, and add more comments for avoiding reader's confusion. Fixes: 6b580f523172 ("ALSA: seq: Protect racy pool manipulation from OSS sequencer") Reviewed-by: Kai Vehmanen Signed-off-by: Takashi Iwai --- sound/core/seq/seq_clientmgr.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'sound/core') diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 3acd80e718f2..c0227a672442 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -191,6 +191,7 @@ bool snd_seq_client_ioctl_lock(int clientid) if (!client) return false; mutex_lock(&client->ioctl_mutex); + /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */ return true; } EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock); @@ -204,7 +205,11 @@ void snd_seq_client_ioctl_unlock(int clientid) if (WARN_ON(!client)) return; mutex_unlock(&client->ioctl_mutex); - snd_use_lock_free(&client->use_lock); + /* The doubly unrefs below are intentional; the first one releases the + * leftover from snd_seq_client_ioctl_lock() above, and the second one + * is for releasing snd_seq_client_use_ptr() in this function + */ + snd_seq_client_unlock(client); snd_seq_client_unlock(client); } EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock); -- cgit v1.2.3