linux-kernel - Re: [PATCH 1/2] libnvdimm: fix clear length of nvdimm_forget

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Date:   Fri, 28 Apr 2017 22:29:16 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>
Subject: Re: [PATCH 1/2] libnvdimm: fix clear length of nvdimm_forget_poison()

On Fri, 2017-04-28 at 14:48 -0700, Dan Williams wrote:
> On Thu, Apr 27, 2017 at 3:57 PM, Toshi Kani <toshi.kani@....com>
> wrote:
> > ND_CMD_CLEAR_ERROR command returns 'clear_err.cleared', the length
> > of error actually cleared, which may be smaller than its requested
> > 'len'.
> > 
> > Change nvdimm_clear_poison() to call nvdimm_forget_poison() with
> > 'clear_err.cleared' when this value is valid.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@....com>
> > Cc: Dan Williams <dan.j.williams@...el.com>
> > Cc: Dave Jiang <dave.jiang@...el.com>
> > Cc: Vishal Verma <vishal.l.verma@...el.com>
> > ---
> > Based on 'libnvdimm-for-next'.
> > ---
> >  drivers/nvdimm/bus.c |    4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> > index d214ac44..43ddfd4 100644
> > --- a/drivers/nvdimm/bus.c
> > +++ b/drivers/nvdimm/bus.c
> > @@ -219,7 +219,9 @@ long nvdimm_clear_poison(struct device *dev,
> > phys_addr_t phys,
> >         if (cmd_rc < 0)
> >                 return cmd_rc;
> > 
> > -       nvdimm_forget_poison(nvdimm_bus, phys, len);
> > +       if (clear_err.cleared > 0)
> > +               nvdimm_forget_poison(nvdimm_bus, phys,
> > clear_err.cleared);
> > +
> >         return clear_err.cleared;
> 
> Looks, good we need to mark this for -stable since the bug is also
> present in current mainline.
> 
> Fixes: e046114af5fc ("libnvdimm: clear the internal poison_list when
> clearing badblocks")

Shall I send a patch based on the current mainline with cc to -stable? 
The func name is nvdimm_clear_from_poison_list() in the mainline.

Thanks,
-Toshi