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Date:   Wed, 20 Oct 2021 09:23:52 +0200
From:   Sean Nyekjaer <sean@geanix.com>
To:     Miquel Raynal <miquel.raynal@bootlin.com>
Cc:     Boris Brezillon <boris.brezillon@collabora.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Boris Brezillon <bbrezillon@kernel.org>,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] mtd: core: protect access to mtd devices while in
 suspend
Message-ID: <20211020072352.7fnano7wm5l4bfi6@skn-laptop>
References: <20211011115253.38497-1-sean@geanix.com>
 <20211011160546.707b737b@collabora.com>
 <20211015082206.244a2316@xps13>
 <20211019180800.3v7emokse6lkpjvk@skn-laptop>
 <20211020085250.030ef244@collabora.com>
 <20211020090058.58af1087@collabora.com>
 <20211020091228.136fde6e@xps13>
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On Wed, Oct 20, 2021 at 09:12:28AM +0200, Miquel Raynal wrote:
> > 
> > Actually, this version is even cleaner:
> > 
> > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> > index 3d6c6e880520..98c39b7f6279 100644
> > --- a/drivers/mtd/nand/raw/nand_base.c
> > +++ b/drivers/mtd/nand/raw/nand_base.c
> > @@ -6222,8 +6222,6 @@ static int nand_scan_tail(struct nand_chip *chip)
> >         mtd->_sync = nand_sync;
> >         mtd->_lock = nand_lock;
> >         mtd->_unlock = nand_unlock;
> > -       mtd->_suspend = nand_suspend;
> > -       mtd->_resume = nand_resume;
> >         mtd->_reboot = nand_shutdown;
> >         mtd->_block_isreserved = nand_block_isreserved;
> >         mtd->_block_isbad = nand_block_isbad;
> > @@ -6261,14 +6259,20 @@ static int nand_scan_tail(struct nand_chip *chip)
> >                 goto err_free_interface_config;
> >  
> >         /* Check, if we should skip the bad block table scan */
> > -       if (chip->options & NAND_SKIP_BBTSCAN)
> > -               return 0;
> > -
> > -       /* Build bad block table */
> > -       ret = nand_create_bbt(chip);
> > -       if (ret)
> > -               goto err_free_secure_regions;
> > +       if (chip->options & NAND_SKIP_BBTSCAN) {
> > +               /* Build bad block table */
> > +               ret = nand_create_bbt(chip);
> > +               if (ret)
> > +                       goto err_free_secure_regions;
> > +       }
> 
> Nice idea.
> 
> >  
> > +       /*
> > +        * Populate the suspend/resume hooks after the BBT has been scanned to
> > +        * avoid using the suspend lock and resume waitqueue which are only
> > +        * initialized when mtd_device_register() is called.
> > +        */
> > +       mtd->_suspend = nand_suspend;
> > +       mtd->_resume = nand_resume;
> >         return 0;
> >  
> >  err_free_secure_regions:

Could be a nice idea, but it doesn't work...
gpmi-nand.c calls nand_create_bbt() after this have run ;)

/Sean