Re: [PATCH v5 0/4] [SCSI] sg: fix race condition in sg_open

[Douglas Gilbert]

On 13-07-22 01:03 PM, JÃrn Engel wrote:
> On Mon, 22 July 2013 12:40:29 +0800, Vaughan Cao wrote:
> > There is a race when open sg with O_EXCL flag. Also a race may happen between
> > sg_open and sg_remove.
> >
> > Changes from v4:
> >   * [3/4] use ERR_PTR series instead of adding another parameter in sg_add_sfp
> >   * [4/4] fix conflict for cherry-pick from v3.
> >
> > Changes from v3:
> >   * release o_sem in sg_release(), not in sg_remove_sfp().
> >   * not set exclude with sfd_lock held.
> >
> > Vaughan Cao (4):
> >    [SCSI] sg: use rwsem to solve race during exclusive open
> >    [SCSI] sg: no need sg_open_exclusive_lock
> >    [SCSI] sg: checking sdp->detached isn't protected when open
> >    [SCSI] sg: push file descriptor list locking down to per-device
> >      locking
> >
> >   drivers/scsi/sg.c | 178 +++++++++++++++++++++++++-----------------------------
> >   1 file changed, 83 insertions(+), 95 deletions(-)
>
> Patchset looks good to me, although I didn't test it on hardware yet.
> Signed-off-by: Joern Engel <joern@xxxxxxxxx>
>
> James, care to pick this up?

Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>

Tested O_EXCL with multiple processes and threads; passed.
sg driver prior to this patch had "leaky" O_EXCL logic
according to the same test. Block device passed.

James, could you clean this up:
  drivers/scsi/sg.c:242:6: warning: unused variable âresâ [-Wunused-variable]

Doug Gilbert


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