blk-mq: Avoid that __bt_get_word() wraps multiple times

If __bt_get_word() is called with last_tag != 0, if the first
find_next_zero_bit() fails, if after wrap-around the
test_and_set_bit() call fails and find_next_zero_bit() succeeds,
if the next test_and_set_bit() call fails and subsequently
find_next_zero_bit() does not find a zero bit, then another
wrap-around will occur. Avoid this by introducing an additional
local variable.

Signed-off-by: Bart Van Assche <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Robert Elliott <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: <[email protected]> # v3.13+
Signed-off-by: Jens Axboe <[email protected]>

0 files changed, 0 insertions, 0 deletions