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| author |   Nick Piggin <npiggin@gmail.com> | 2011-02-25 14:44:26 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2011-02-25 15:07:37 -0800 |
| commit | 3bd9a5d734c7cc7533b27abf451416c7f50095a7 (patch) | |
| tree | 357fc4ec95d7163cb96891151df51f6d7d130d0a /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | mm: fix dubious code in __count_immobile_pages() (diff) | |
| download | linux-rng-3bd9a5d734c7cc7533b27abf451416c7f50095a7.tar.xz linux-rng-3bd9a5d734c7cc7533b27abf451416c7f50095a7.zip | |
aio: fix rcu ioctx lookup
aio-dio-invalidate-failure GPFs in aio_put_req from io_submit.
lookup_ioctx doesn't implement the rcu lookup pattern properly.
rcu_read_lock does not prevent refcount going to zero, so we might take
a refcount on a zero count ioctx.
Fix the bug by atomically testing for zero refcount before incrementing.
[jack@suse.cz: added comment into the code]
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions