linux-kernel - Re: [PATCH] scsi: sd: call device_del() if device_add

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Message-ID: <574d33978be5eb4732cd3bf61727e6b509a7e484.camel@linux.ibm.com>
Date:   Thu, 31 Mar 2022 10:19:57 -0400
From:   James Bottomley <jejb@...ux.ibm.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Wenchao Hao <haowenchao@...wei.com>,
        syzkaller-bugs@...glegroups.com
Cc:     fmdefrancesco@...il.com, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        syzbot+f08c77040fa163a75a46@...kaller.appspotmail.com,
        linfeilong@...wei.com
Subject: Re: [PATCH] scsi: sd: call device_del() if device_add_disk() fails

On Thu, 2022-03-31 at 16:42 +0300, Dan Carpenter wrote:
[...]
> Also, I don't really understand why we don't have to call
> put_device(&sdkp->disk_dev) at the end of sd_remove().

That's because the final put is done by the gendisk ->free_disk()
function which is scsi_disk_free_disk().  Most of the gendisk functions
we provide convert a gendisk to a scsi_disk (via the gendisk
private_data), so the sdkp has to live as long as the gendisk.

James