https://github.com/torvalds/linux
Revision 399ccdc1cd4e92e541d4dacbbf18c52bd693418b authored by Takashi Iwai on 25 September 2008, 12:51:03 UTC, committed by Takashi Iwai on 25 September 2008, 12:51:03 UTC
The PCM and rawmidi open callbacks have a lock against card->controls_list but it takes a wrong one, card->controls_rwsem, instead of a right one card->ctl_files_rwlock. This patch fixes them. This change also fixes automatically the potential deadlocks due to mm->mmap_sem in munmap and copy_from/to_user, reported by Sitsofe Wheeler: A: snd_ctl_elem_user_tlv(): card->controls_rwsem => mm->mmap_sem B: snd_pcm_open(): card->open_mutex => card->controls_rwsem C: munmap: mm->mmap_sem => snd_pcm_release(): card->open_mutex The patch breaks the chain. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Tip revision: 399ccdc1cd4e92e541d4dacbbf18c52bd693418b authored by Takashi Iwai on 25 September 2008, 12:51:03 UTC
ALSA: fix locking in snd_pcm_open*() and snd_rawmidi_open*()
ALSA: fix locking in snd_pcm_open*() and snd_rawmidi_open*()
Tip revision: 399ccdc
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| .gitignore | -rw-r--r-- | 867 bytes |
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| Makefile | -rw-r--r-- | 55.4 KB |
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