linux-kernel - Re: [PATCH v3 2/8] scsi/sr: add error handling support for add

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Message-ID: <YT+JsQ7pgtz0E2ZK@bombadil.infradead.org>
Date:   Mon, 13 Sep 2021 10:26:09 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Ming Lei <ming.lei@...hat.com>
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, hch@...radead.org, hare@...e.de,
        bvanassche@....org, 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,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3 2/8] scsi/sr: add error handling support for add_disk()

On Tue, Sep 07, 2021 at 09:37:05AM +0800, Ming Lei wrote:
> On Mon, Aug 30, 2021 at 02:25:32PM -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.
> > 
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> > ---
> >  drivers/scsi/sr.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> > index 2942a4ec9bdd..72fd21844367 100644
> > --- a/drivers/scsi/sr.c
> > +++ b/drivers/scsi/sr.c
> > @@ -779,7 +779,10 @@ static int sr_probe(struct device *dev)
> >  	dev_set_drvdata(dev, cd);
> >  	disk->flags |= GENHD_FL_REMOVABLE;
> >  	sr_revalidate_disk(cd);
> > -	device_add_disk(&sdev->sdev_gendev, disk, NULL);
> > +
> > +	error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
> > +	if (error)
> > +		goto fail_minor;
> 
> You don't undo register_cdrom(), maybe you can use kref_put(&cd->kref, sr_kref_release);
> to simplify the error handling.

Works with me, thanks!

  Luis