[PATCH] mtd_blkdevs: don't scan partitions for plain mtdblock

[Geert Uytterhoeven]

Hi Jens,

On Fri, Dec 10, 2021 at 7:52 PM Jens Axboe <axboe at kernel.dk> wrote:
> On Mon, Dec 6, 2021 at 12:04 AM Christoph Hellwig <hch at lst.de> wrote:
> > mtdblock / mtdblock_ro set part_bits to 0 and thus nevever scanned
> > partitions.  Restore that behavior by setting the GENHD_FL_NO_PART flag.
> >
> > Fixes: 1ebe2e5f9d68e94c ("block: remove GENHD_FL_EXT_DEVT")
> > Reported-by: Geert Uytterhoeven <geert+renesas at glider.be>
> > Signed-off-by: Christoph Hellwig <hch at lst.de>
> > Tested-by: Geert Uytterhoeven <geert+renesas at glider.be>

> > @@ -355,9 +355,11 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
> >                                  "%s%c%c", tr->name,
> >                                  'a' - 1 + new->devnum / 26,
> >                                  'a' + new->devnum % 26);
> > -       else
> > +       } else {
> >                 snprintf(gd->disk_name, sizeof(gd->disk_name),
> >                          "%s%d", tr->name, new->devnum);
> > +               gd->flags |= GENHD_FL_NO_PART;
> > +       }
>
> Not sure why I didn't spot this until now, but:
>
> drivers/mtd/mtd_blkdevs.c: In function ‘add_mtd_blktrans_dev’:
> drivers/mtd/mtd_blkdevs.c:362:30: error: ‘GENHD_FL_NO_PART’ undeclared (first use in this function); did you mean ‘GENHD_FL_NO_PART_SCAN’?
>   362 |                 gd->flags |= GENHD_FL_NO_PART;
>       |                              ^~~~~~~~~~~~~~~~
>       |                              GENHD_FL_NO_PART_SCAN
> drivers/mtd/mtd_blkdevs.c:362:30: note: each undeclared identifier is reported only once for each function it appears in
>
> Hmm?
>
> I'm going to revert this one for now, not sure how it could've been
> tested in this form.

Because next-20211130 and later have commit 46e7eac647b34ed4 ("block:
rename GENHD_FL_NO_PART_SCAN to GENHD_FL_NO_PART").

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds