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[ Upstream commit 95cc637c1afd83fb7dd3d7c8a53710488f4caf9c ] For avoiding the potential deadlock via kill_fasync() call, use the new fasync helpers to defer the invocation from PCI API. Note that it's merely a workaround. Reported-by: syzbot+1ee0910eca9c94f71f25@syzkaller.appspotmail.com Reported-by: syzbot+49b10793b867871ee26f@syzkaller.appspotmail.com Reported-by: syzbot+8285e973a41b5aa68902@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20220728125945.29533-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>