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| author | Tejun Heo <tj@kernel.org> | 2011-12-14 00:33:38 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2011-12-14 00:33:38 +0100 |
| commit | 216284c352a0061f5b20acff2c4e50fb43fea183 (patch) | |
| tree | 01611f6d35c041a941269cb3dd3926c0711722ae /scripts | |
| parent | block, cfq: move ioc ioprio/cgroup changed handling to cic (diff) | |
| download | linux-216284c352a0061f5b20acff2c4e50fb43fea183.tar.xz linux-216284c352a0061f5b20acff2c4e50fb43fea183.zip | |
block, cfq: fix race condition in cic creation path and tighten locking
cfq_get_io_context() would fail if multiple tasks race to insert cic's
for the same association. This patch restructures
cfq_get_io_context() such that slow path insertion race is handled
properly.
Note that the restructuring also makes cfq_get_io_context() called
under queue_lock and performs both ioc and cfqd insertions while
holding both ioc and queue locks. This is part of on-going locking
tightening and will be used to simplify synchronization rules.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions