linux-kernel - [PATCH v2 0/1] bsg: fix regression resulting in panics when sending commands via BSG

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Date:   Thu, 24 Aug 2017 01:57:55 +0200
From:   Benjamin Block <bblock@...ux.vnet.ibm.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Benjamin Block <bblock@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>,
        Steffen Maier <maier@...ux.vnet.ibm.com>
Subject: [PATCH v2 0/1] bsg: fix regression resulting in panics when sending commands via BSG

Hello all,

This is the second try for fixing the regression in the BSG-interface that
exists since v4.11 (for more infos see the first series).

I separated my other changes from the bug-fix so that it is easier to apply
if judged good. I will rebase my cleanups I sent in v1 and send them when I
get a bit more time. But the regression-fix is more important, so here's
that.

I did some more tests on it than on v1, including some heavy parallel I/O
on the same blk-queue using both BSG and the normal SCSI-stack at the same
time (throwing some intentional bad commands in it too). That seemed to
work all well enough - i.e. it didn't crash and got the expected results. I
haven't done any external error-inject, but IMO that would be beyond the
scope right now.

The fix is based on Christoph's idea, I discussed this with him off-list
already.

I rebased the series on Jens' for-next.

Reviews are more than welcome :)

                                                Beste Grüße / Best regards,
                                                  - Benjamin Block

Benjamin Block (1):
  bsg-lib: fix kernel panic resulting from missing allocation of
    reply-buffer

 block/bsg-lib.c         | 74 +++++++++++++++++++++++++++++--------------------
 include/linux/blkdev.h  |  1 -
 include/linux/bsg-lib.h |  2 ++
 3 files changed, 46 insertions(+), 31 deletions(-)

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