linux-kernel - Re: [PATCH] xen/blkfront: When purging persistent grants, keep them in the buffer

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Message-ID: <28aa9249-7406-21c6-f509-65411828e2d7@suse.com>
Date:   Thu, 27 Sep 2018 09:12:56 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        konrad.wilk@...cle.com, roger.pau@...rix.com, axboe@...nel.dk
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/blkfront: When purging persistent grants, keep them
 in the buffer

On 22/09/18 21:55, Boris Ostrovsky wrote:
> Commit a46b53672b2c ("xen/blkfront: cleanup stale persistent grants")
> added support for purging persistent grants when they are not in use. As
> part of the purge, the grants were removed from the grant buffer, This
> eventually causes the buffer to become empty, with BUG_ON triggered in
> get_free_grant(). This can be observed even on an idle system, within
> 20-30 minutes.
> 
> We should keep the grants in the buffer when purging, and only free the
> grant ref.
> 
> Fixes: a46b53672b2c ("xen/blkfront: cleanup stale persistent grants")
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

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


Juergen