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From: Greg KH <gregkh@linuxfoundation.org>
To: Juergen Gross <jgross@suse.com>
Cc: stable@vger.kernel.org, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [Patch-for-4.4] xen/blkback: don't use xen_blkif_get() in xen-blkback kthread
Date: Fri, 4 Aug 2017 12:57:22 -0700	[thread overview]
Message-ID: <20170804195722.GF3477@kroah.com> (raw)
In-Reply-To: <20170802092745.18907-2-jgross@suse.com>

On Wed, Aug 02, 2017 at 11:27:45AM +0200, Juergen Gross wrote:
> There is no need to use xen_blkif_get()/xen_blkif_put() in the kthread
> of xen-blkback. Thread stopping is synchronous and using the blkif
> reference counting in the kthread will avoid to ever let the reference
> count drop to zero at the end of an I/O running concurrent to
> disconnecting.
> 
> Setting ring->xenblkd to NULL after stopping the kthread isn't needed
> as the kthread does this already.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>
> Tested-by: Steven Haigh <netwiz@crc.id.au>
> Acked-by: Roger Pau Monn� <roger.pau@citrix.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
> This is a backport of commit a24fa22ce22ae302b3bf8f7008896d52d5d57b8d
> for linux-4.4.y branch.

Both patches now applied, thanks.

greg k-h

      reply	other threads:[~2017-08-04 19:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-02  9:27 [Patch-for-4.4] xen/blkback: don't free be structure too early Juergen Gross
2017-08-02  9:27 ` [Patch-for-4.4] xen/blkback: don't use xen_blkif_get() in xen-blkback kthread Juergen Gross
2017-08-04 19:57   ` Greg KH [this message]

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