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| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-05-31 16:26:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-31 17:49:30 -0700 |
| commit | af1be5a578a1ccc9961c55290f8c509a00a69036 (patch) | |
| tree | f8659ba36228582a114c7809bdf580640eb626cf /arch/um | |
| parent | 2214f707de257c35773d5cd68cec9e31b91e01ca (diff) | |
| download | linux-af1be5a578a1ccc9961c55290f8c509a00a69036.tar.gz linux-af1be5a578a1ccc9961c55290f8c509a00a69036.tar.bz2 linux-af1be5a578a1ccc9961c55290f8c509a00a69036.zip | |
blackfin: fix possible deadlock in decode_address()
Oleg Nesterov found an interesting deadlock possibility:
> sysrq_showregs_othercpus() does smp_call_function(showacpu)
> and showacpu() show_stack()->decode_address(). Now suppose that IPI
> interrupts the task holding read_lock(tasklist).
To fix this, blackfin should not grab the write_ variant of the
tasklist lock, read_ one is enough.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um')
0 files changed, 0 insertions, 0 deletions