linux-kernel - Re: [PATCH] block: Suppress uevent for hidden device when removed

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Date:   Mon, 8 Mar 2021 19:37:51 +0100
From:   Christoph Hellwig <hch@....de>
To:     Martin Wilck <mwilck@...e.com>
Cc:     Daniel Wagner <dwagner@...e.de>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] block: Suppress uevent for hidden device when removed

On Wed, Mar 03, 2021 at 06:30:34PM +0100, Martin Wilck wrote:
> I wonder if it wouldn't be wiser to remove this code
> 
>         if (disk->flags & GENHD_FL_HIDDEN) {
>                 dev_set_uevent_suppress(ddev, 0);
>                 return;
>         }
> 
> from register_disk(). The way you did it now, we would receive neither
> "add" nor "remove" events in user space, but there might be change
> events in between ?

Well, we'll need to keep the return.  That being said keepign the
uevents supressed entirely might be a good idea.