[PATCH 2/2] cfq: fix cic's rbtree traversal
OGAWA Hirofumi authored

When queue dies, we set cic->key=NULL as dead mark. So, when we
traverse a rbtree, we must check whether it's still valid key. if it
was invalidated, drop it, then restart the traversal from top.
Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: default avatarJens Axboe <axboe@suse.de>
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