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| author |  Jens Axboe <jens.axboe@oracle.com>
| 2008-05-07 09:17:12 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com>
| 2008-05-07 09:28:57 +0200 |
| commit | 07416d29bcf608257f1e5280642dcbe0021518a3 (patch) | |
| tree | 6b88b2b043cac10b34234320c68e06848c00127c /lib | |
| parent | block: adjust tagging function queue bit locking (diff) | |
| download | linux-07416d29bcf608257f1e5280642dcbe0021518a3.tar.gz linux-07416d29bcf608257f1e5280642dcbe0021518a3.tar.bz2 linux-07416d29bcf608257f1e5280642dcbe0021518a3.zip | |
cfq-iosched: fix RCU race in the cfq io_context destructor handling
put_io_context() drops the RCU read lock before calling into cfq_dtor(),
however we need to hold off freeing there before grabbing and
dereferencing the first object on the list.
So extend the rcu_read_lock() scope to cover the calling of cfq_dtor(),
and optimize cfq_free_io_context() to use a new variant for
call_for_each_cic() that assumes the RCU read lock is already held.
Hit in the wild by Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions