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Tsirkin" , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , Stefano Garzarella CC: , , , , , , , Subject: [RFC PATCH 08/22] rpmsg: virtio_rpmsg_bus: Disable receive virtqueue callback when reading messages Date: Thu, 2 Jul 2020 13:51:29 +0530 Message-ID: <20200702082143.25259-9-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702082143.25259-1-kishon@ti.com> References: <20200702082143.25259-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Since rpmsg_recv_done() reads messages in a while loop, disable callbacks until the while loop exits. This helps to get rid of the annoying "uhm, incoming signal, but no used buffer ?" message. Signed-off-by: Kishon Vijay Abraham I --- drivers/rpmsg/virtio_rpmsg_bus.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) -- 2.17.1 diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index 376ebbf880d6..2d0d42084ac0 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -777,6 +777,7 @@ static void rpmsg_recv_done(struct virtqueue *rvq) return; } + virtqueue_disable_cb(rvq); while (msg) { err = rpmsg_recv_single(vrp, dev, msg, len); if (err) @@ -786,6 +787,19 @@ static void rpmsg_recv_done(struct virtqueue *rvq) msg = virtqueue_get_buf(rvq, &len); } + virtqueue_enable_cb(rvq); + + /* + * Try to read message one more time in case a new message is submitted + * after virtqueue_get_buf() inside the while loop but before enabling + * callbacks + */ + msg = virtqueue_get_buf(rvq, &len); + if (msg) { + err = rpmsg_recv_single(vrp, dev, msg, len); + if (!err) + msgs_received++; + } dev_dbg(dev, "Received %u messages\n", msgs_received);