[PATCH] libnvdimm/bus: return the outvar 'cmd_rc' error code in __nd_ioctl()

[Dan Williams]

On Tue, Feb 18, 2020 at 1:00 PM Jeff Moyer <jmoyer at redhat.com> wrote:
>
> Vaibhav Jain <vaibhav at linux.ibm.com> writes:
>
> > Presently the error code returned via out variable 'cmd_rc' from the
> > nvdimm-bus controller function is ignored when called from
> > __nd_ioctl() and never communicated back to user-space code that called
> > an ioctl on dimm/bus.
> >
> > This minor patch updates __nd_ioctl() to propagate the value of out
> > variable 'cmd_rc' back to user-space in case it reports an error.
> >
> > Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>
> > ---
> >  drivers/nvdimm/bus.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> > index a8b515968569..5b687a27fdf2 100644
> > --- a/drivers/nvdimm/bus.c
> > +++ b/drivers/nvdimm/bus.c
> > @@ -1153,6 +1153,11 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
> >       if (rc < 0)
> >               goto out_unlock;
> >
> > +     if (cmd_rc < 0) {
> > +             rc = cmd_rc;
> > +             goto out_unlock;
> > +     }
> > +
> >       if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
> >               struct nd_cmd_clear_error *clear_err = buf;
>
> Looks good to me.
>
> Reviewed-by: Jeff Moyer <jmoyer at redhat.com>

Applied.