This is a note to let you know that I've just added the patch titled ALSA: core: remove redundant spin_lock pair in snd_card_disconnect to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alsa-core-remove-redundant-spin_lock-pair-in-snd_car.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 8912c1f8ac12a85f3ba0ccb1adf75b28aa59807c Author: Jia Zhou <zhou.jia2@xxxxxxxxxx> Date: Tue Mar 30 13:19:23 2021 +0200 ALSA: core: remove redundant spin_lock pair in snd_card_disconnect [ Upstream commit abc21649b3e5c34b143bf86f0c78e33d5815e250 ] modification in commit 2a3f7221acdd ("ALSA: core: Fix card races between register and disconnect") resulting in this problem. Fixes: 2a3f7221acdd ("ALSA: core: Fix card races between register and disconnect") Signed-off-by: Jia Zhou <zhou.jia2@xxxxxxxxxx> Signed-off-by: Yi Wang <wang.yi59@xxxxxxxxxx> Link: https://lore.kernel.org/r/1616989007-34429-1-git-send-email-wang.yi59@xxxxxxxxxx Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/sound/core/init.c b/sound/core/init.c index 018ce4ef12ec..9f5270c90a10 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -390,10 +390,8 @@ int snd_card_disconnect(struct snd_card *card) return 0; } card->shutdown = 1; - spin_unlock(&card->files_lock); /* replace file->f_op with special dummy operations */ - spin_lock(&card->files_lock); list_for_each_entry(mfile, &card->files_list, list) { /* it's critical part, use endless loop */ /* we have no room to fail */