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authorJens Axboe <jens.axboe@oracle.com>2008-05-07 09:17:12 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-05-07 09:28:57 +0200
commit07416d29bcf608257f1e5280642dcbe0021518a3 (patch)
tree6b88b2b043cac10b34234320c68e06848c00127c /fs/attr.c
parentblock: adjust tagging function queue bit locking (diff)
downloadlinux-07416d29bcf608257f1e5280642dcbe0021518a3.tar.xz
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 'fs/attr.c')
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