linux-kernel - [PATCH BUGFIX] block, bfq: fix bug related to the burst

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Message-Id: <20171009111123.2961-1-paolo.valente@linaro.org>
Date:   Mon,  9 Oct 2017 13:11:22 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, broonie@...nel.org, lee.tibbert@...il.com,
        oleksandr@...alenko.name, angeloruocco90@...il.com,
        philm@...jaro.org, Paolo Valente <paolo.valente@...aro.org>
Subject: [PATCH BUGFIX]  block, bfq: fix bug related to the burst_size counter

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(-)

--
2.10.0