linux-kernel - Re: [PATCH 06/10] mmc/core/block: add error handling support for add

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Date:   Fri, 27 Aug 2021 11:42:36 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     axboe@...nel.dk, martin.petersen@...cle.com, jejb@...ux.ibm.com,
        kbusch@...nel.org, sagi@...mberg.me, adrian.hunter@...el.com,
        beanhuo@...ron.com, ulf.hansson@...aro.org, avri.altman@....com,
        swboyd@...omium.org, agk@...hat.com, snitzer@...hat.com,
        josef@...icpanda.com, hare@...e.de, bvanassche@....org,
        ming.lei@...hat.com, linux-scsi@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-mmc@...r.kernel.org,
        dm-devel@...hat.com, nbd@...er.debian.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/10] mmc/core/block: add error handling support for
 add_disk()

On Tue, Aug 24, 2021 at 07:13:13AM +0100, Christoph Hellwig wrote:
> On Mon, Aug 23, 2021 at 01:29:26PM -0700, Luis Chamberlain wrote:
> > We never checked for errors on add_disk() as this function
> > returned void. Now that this is fixed, use the shiny new
> > error handling.
> > 
> > The caller cleanups the disk already so all we need to do
> > is just pass along the return value.
> > 
> > Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> > ---
> >  drivers/mmc/core/block.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> > index 4c11f171e56d..4f12c6d1e1b5 100644
> > --- a/drivers/mmc/core/block.c
> > +++ b/drivers/mmc/core/block.c
> > @@ -2432,7 +2432,9 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
> >  	/* used in ->open, must be set before add_disk: */
> >  	if (area_type == MMC_BLK_DATA_AREA_MAIN)
> >  		dev_set_drvdata(&card->dev, md);
> > -	device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
> > +	ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
> > +	if (ret)
> > +		goto out;
> 
> This needs to do a blk_cleanup_queue and also te kfree of md.

If mmc_blk_alloc_parts() fails mmc_blk_remove_req() is called which
does both for us?

 Luis