[PATCH v2] um: virtio: remove device on disconnect

[PATCH v2] um: virtio: remove device on disconnect

[Johannes Berg]

From: Johannes Berg <johannes.berg@intel.com>

If the connection drops, just remove the device, we don't try
to recover from this right now.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 arch/um/drivers/virtio_uml.c | 62 +++++++++++++++++++++++++-----------
 1 file changed, 43 insertions(+), 19 deletions(-)

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index a2d9b3347945..d47dcdc212aa 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -46,6 +46,13 @@
 #define to_virtio_uml_device(_vdev) \
 	container_of(_vdev, struct virtio_uml_device, vdev)
 
+struct virtio_uml_platform_data {
+	u32 virtio_device_id;
+	const char *socket_path;
+	struct work_struct conn_broken_wk;
+	struct platform_device *pdev;
+};
+
 struct virtio_uml_device {
 	struct virtio_device vdev;
 	struct platform_device *pdev;
@@ -111,12 +118,21 @@ static int vhost_user_recv_header(int fd, struct vhost_user_msg *msg)
 	return full_read(fd, msg, sizeof(msg->header));
 }
 
-static int vhost_user_recv(int fd, struct vhost_user_msg *msg,
+static int vhost_user_recv(struct virtio_uml_device *vu_dev,
+			   int fd, struct vhost_user_msg *msg,
 			   size_t max_payload_size)
 {
 	size_t size;
 	int rc = vhost_user_recv_header(fd, msg);
 
+	if (rc == -ECONNRESET) {
+		struct virtio_uml_platform_data *pdata;
+
+		pdata = vu_dev->pdev->dev.platform_data;
+
+		virtio_break_device(&vu_dev->vdev);
+		schedule_work(&pdata->conn_broken_wk);
+	}
 	if (rc)
 		return rc;
 	size = msg->header.size;
@@ -129,7 +145,7 @@ static int vhost_user_recv_resp(struct virtio_uml_device *vu_dev,
 				struct vhost_user_msg *msg,
 				size_t max_payload_size)
 {
-	int rc = vhost_user_recv(vu_dev->sock, msg, max_payload_size);
+	int rc = vhost_user_recv(vu_dev, vu_dev->sock, msg, max_payload_size);
 
 	if (rc)
 		return rc;
@@ -159,7 +175,7 @@ static int vhost_user_recv_req(struct virtio_uml_device *vu_dev,
 			       struct vhost_user_msg *msg,
 			       size_t max_payload_size)
 {
-	int rc = vhost_user_recv(vu_dev->req_fd, msg, max_payload_size);
+	int rc = vhost_user_recv(vu_dev, vu_dev->req_fd, msg, max_payload_size);
 
 	if (rc)
 		return rc;
@@ -972,11 +988,6 @@ static void virtio_uml_release_dev(struct device *d)
 
 /* Platform device */
 
-struct virtio_uml_platform_data {
-	u32 virtio_device_id;
-	const char *socket_path;
-};
-
 static int virtio_uml_probe(struct platform_device *pdev)
 {
 	struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
@@ -1043,13 +1054,31 @@ static struct device vu_cmdline_parent = {
 static bool vu_cmdline_parent_registered;
 static int vu_cmdline_id;
 
+static int vu_unregister_cmdline_device(struct device *dev, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
+
+	kfree(pdata->socket_path);
+	platform_device_unregister(pdev);
+	return 0;
+}
+
+static void vu_conn_broken(struct work_struct *wk)
+{
+	struct virtio_uml_platform_data *pdata;
+
+	pdata = container_of(wk, struct virtio_uml_platform_data, conn_broken_wk);
+	vu_unregister_cmdline_device(&pdata->pdev->dev, NULL);
+}
+
 static int vu_cmdline_set(const char *device, const struct kernel_param *kp)
 {
 	const char *ids = strchr(device, ':');
 	unsigned int virtio_device_id;
 	int processed, consumed, err;
 	char *socket_path;
-	struct virtio_uml_platform_data pdata;
+	struct virtio_uml_platform_data pdata, *ppdata;
 	struct platform_device *pdev;
 
 	if (!ids || ids == device)
@@ -1088,6 +1117,11 @@ static int vu_cmdline_set(const char *device, const struct kernel_param *kp)
 	err = PTR_ERR_OR_ZERO(pdev);
 	if (err)
 		goto free;
+
+	ppdata = pdev->dev.platform_data;
+	ppdata->pdev = pdev;
+	INIT_WORK(&ppdata->conn_broken_wk, vu_conn_broken);
+
 	return 0;
 
 free:
@@ -1130,16 +1164,6 @@ __uml_help(vu_cmdline_param_ops,
 );
 
 
-static int vu_unregister_cmdline_device(struct device *dev, void *data)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct virtio_uml_platform_data *pdata = pdev->dev.platform_data;
-
-	kfree(pdata->socket_path);
-	platform_device_unregister(pdev);
-	return 0;
-}
-
 static void vu_unregister_cmdline_devices(void)
 {
 	if (vu_cmdline_parent_registered) {
-- 
2.20.1


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