From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [PATCH v4 1/3] virtio-balloon: tweak config_changed implementation Date: Tue, 8 Jan 2019 08:10:34 +0100 Message-ID: <20190108071034.GA32048@kroah.com> References: <1546923005-40517-1-git-send-email-wei.w.wang@intel.com> <1546923005-40517-2-git-send-email-wei.w.wang@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, mst@redhat.com, cohuck@redhat.com, borntraeger@de.ibm.com, pbonzini@redhat.com, dgilbert@redhat.com, pasic@linux.ibm.com To: Wei Wang Return-path: Content-Disposition: inline In-Reply-To: <1546923005-40517-2-git-send-email-wei.w.wang@intel.com> Sender: stable-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On Tue, Jan 08, 2019 at 12:50:03PM +0800, Wei Wang wrote: > virtio-ccw has deadlock issues with reading the config space inside the > interrupt context, so we tweak the virtballoon_changed implementation > by moving the config read operations into the related workqueue contexts. > The config_read_bitmap is used as a flag to the workqueue callbacks > about the related config fields that need to be read. > > The cmd_id_received is also renamed to cmd_id_received_cache, and > the value should be obtained via virtio_balloon_cmd_id_received. > > Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT") > Reported-by: Christian Borntraeger > Signed-off-by: Wei Wang > Reviewed-by: Cornelia Huck > Reviewed-by: Halil Pasic > Tested-by: Christian Borntraeger > --- > drivers/virtio/virtio_balloon.c | 98 +++++++++++++++++++++++++++-------------- > 1 file changed, 65 insertions(+), 33 deletions(-) > This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.