[PATCH BUGFIX] block, bfq: fix bug related to the burst_size counter

[Paolo Valente]

Hi Jens,
unfortunately, the patch "block, bfq: decrease burst size when queues
in burst exit", queued for 4.15 [1] introduces a bug, described in
detail in the commit message of this patch. If triggered, this bug may
cause loss of control on I/O-request service order.

Please queue this fix right after the patch introducing the bug.

Thanks,
Paolo

[1] https://lkml.org/lkml/2017/9/21/144

Paolo Valente (1):
  block, bfq: fix unbalanced decrements of burst size

 block/bfq-iosched.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)

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2.10.0