linux-kernel - Re: [PATCH v2 09/10] xen-blkfront: add error handling support for add

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Date:   Thu, 30 Sep 2021 15:07:44 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Luis Chamberlain <mcgrof@...nel.org>, axboe@...nel.dk,
        colyli@...e.de, kent.overstreet@...il.com, kbusch@...nel.org,
        sagi@...mberg.me, vishal.l.verma@...el.com,
        dan.j.williams@...el.com, dave.jiang@...el.com,
        ira.weiny@...el.com, konrad.wilk@...cle.com, roger.pau@...rix.com,
        boris.ostrovsky@...cle.com, sstabellini@...nel.org,
        minchan@...nel.org, ngupta@...are.org, senozhatsky@...omium.org
Cc:     xen-devel@...ts.xenproject.org, nvdimm@...ts.linux.dev,
        linux-nvme@...ts.infradead.org, linux-bcache@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/10] xen-blkfront: add error handling support for
 add_disk()

On 28.09.21 00:00, Luis Chamberlain wrote:
> We never checked for errors on device_add_disk() as this function
> returned void. Now that this is fixed, use the shiny new error
> handling. The function xlvbd_alloc_gendisk() typically does the
> unwinding on error on allocating the disk and creating the tag,
> but since all that error handling was stuffed inside
> xlvbd_alloc_gendisk() we must repeat the tag free'ing as well.
> 
> We set the info->rq to NULL to ensure blkif_free() doesn't crash
> on blk_mq_stop_hw_queues() on device_add_disk() error as the queue
> will be long gone by then.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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