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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Ohad Ben-Cohen <ohad@wizery.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Jon Mason <jdmason@kudzu.us>, Dave Jiang <dave.jiang@intel.com>,
	Allen Hubbe <allenbh@gmail.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>
Cc: <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-remoteproc@vger.kernel.org>, <linux-ntb@googlegroups.com>,
	<linux-pci@vger.kernel.org>, <kvm@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<netdev@vger.kernel.org>
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> (raw)
In-Reply-To: <20200702082143.25259-1-kishon@ti.com>

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 <kishon@ti.com>
---
 drivers/rpmsg/virtio_rpmsg_bus.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

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);
 
-- 
2.17.1


  parent reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02  8:21 [RFC PATCH 00/22] Enhance VHOST to enable SoC-to-SoC communication Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 01/22] vhost: Make _feature_ bits a property of vhost device Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 02/22] vhost: Introduce standard Linux driver model in VHOST Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 03/22] vhost: Add ops for the VHOST driver to configure VHOST device Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 04/22] vringh: Add helpers to access vring in MMIO Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 05/22] vhost: Add MMIO helpers for operations on vhost virtqueue Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 06/22] vhost: Introduce configfs entry for configuring VHOST Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 07/22] virtio_pci: Use request_threaded_irq() instead of request_irq() Kishon Vijay Abraham I
2020-07-02  8:21 ` Kishon Vijay Abraham I [this message]
2020-07-02  8:21 ` [RFC PATCH 09/22] rpmsg: Introduce configfs entry for configuring rpmsg Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 10/22] rpmsg: virtio_rpmsg_bus: Add Address Service Notification support Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 11/22] rpmsg: virtio_rpmsg_bus: Move generic rpmsg structure to rpmsg_internal.h Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 12/22] virtio: Add ops to allocate and free buffer Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 13/22] rpmsg: virtio_rpmsg_bus: Use virtio_alloc_buffer() and virtio_free_buffer() Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 14/22] rpmsg: Add VHOST based remote processor messaging bus Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 15/22] samples/rpmsg: Setup delayed work to send message Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 16/22] samples/rpmsg: Wait for address to be bound to rpdev for sending message Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 17/22] rpmsg.txt: Add Documentation to configure rpmsg using configfs Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 18/22] virtio_pci: Add VIRTIO driver for VHOST on Configurable PCIe Endpoint device Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 19/22] PCI: endpoint: Add EP function driver to provide VHOST interface Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 20/22] NTB: Add a new NTB client driver to implement VIRTIO functionality Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 21/22] NTB: Add a new NTB client driver to implement VHOST functionality Kishon Vijay Abraham I
2020-07-02  8:21 ` [RFC PATCH 22/22] NTB: Describe ntb_virtio and ntb_vhost client in the documentation Kishon Vijay Abraham I
2020-07-02  9:51 ` [RFC PATCH 00/22] Enhance VHOST to enable SoC-to-SoC communication Michael S. Tsirkin
2020-07-02 10:10   ` Jason Wang
2020-07-02 13:35     ` Kishon Vijay Abraham I
2020-07-03  7:16       ` Jason Wang
2020-07-06  9:32         ` Kishon Vijay Abraham I
2020-07-07  9:47           ` Jason Wang
2020-07-07 14:45             ` Kishon Vijay Abraham I
2020-07-08 11:22               ` Jason Wang
2020-07-08 13:13                 ` Kishon Vijay Abraham I
2020-07-09  6:26                   ` Jason Wang
2020-07-15 17:15                   ` Mathieu Poirier
2020-07-02 10:25   ` Kishon Vijay Abraham I
2020-07-02 17:31   ` Mathieu Poirier
2020-07-03  6:17     ` Kishon Vijay Abraham I

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