linux-kernel - Re: [PATCH 02/13] nvme-multipath: add error handling support for add

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Date:   Mon, 18 Oct 2021 05:34:12 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "geoff@...radead.org" <geoff@...radead.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "jim@...n.com" <jim@...n.com>,
        "minchan@...nel.org" <minchan@...nel.org>,
        "ngupta@...are.org" <ngupta@...are.org>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "richard@....at" <richard@....at>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "ira.weiny@...el.com" <ira.weiny@...el.com>,
        "kbusch@...nel.org" <kbusch@...nel.org>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/13] nvme-multipath: add error handling support for
 add_disk()

On 10/15/21 16:52, 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.
> 
> Since we now can tell for sure when a disk was added, move
> setting the bit NVME_NSHEAD_DISK_LIVE only when we did
> add the disk successfully.
> 
> Nothing to do here as the cleanup is done elsewhere. We take
> care and use test_and_set_bit() because it is protects against
> two nvme paths simultaneously calling device_add_disk() on the
> same namespace head.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>


Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>