Takashi Iwai b248371628 ALSA: pcm: Fix potential deadlock in OSS emulation ... There are potential deadlocks in PCM OSS emulation code while accessing read/write and mmap concurrently. This comes from the infamous mmap_sem usage in copy_from/to_user(). Namely, snd_pcm_oss_write() -> &runtime->oss.params_lock -> copy_to_user() -> &mm->mmap_sem mmap() -> &mm->mmap_sem -> snd_pcm_oss_mmap() -> &runtime->oss.params_lock Since we can't avoid taking params_lock from mmap code path, use trylock variant and aborts with -EAGAIN as a workaround of this AB/BA deadlock. BugLink: http://lkml.kernel.org/r/CACT4Y+bVrBKDG0G2_AcUgUQa+X91VKTeS4v+wN7BSHwHtqn3kQ@mail.gmail.com Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>		2016-02-01 12:23:29 +01:00
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copy.c
io.c
linear.c
Makefile
mixer_oss.c
mulaw.c
pcm_oss.c	ALSA: pcm: Fix potential deadlock in OSS emulation	2016-02-01 12:23:29 +01:00
pcm_plugin.c
pcm_plugin.h
rate.c
route.c