linux-kernel - [PATCH 3/9] virtio-console: switch to use .validate()

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Date:   Mon, 13 Sep 2021 13:53:47 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, f.hetzelt@...berlin.de,
        david.kaplan@....com, konrad.wilk@...cle.com,
        Amit Shah <amit@...nel.org>
Subject: [PATCH 3/9] virtio-console: switch to use .validate()

This patch switches to use validate() to filter out the features that
is not supported by the rproc.

Cc: Amit Shah <amit@...nel.org>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/char/virtio_console.c | 41 ++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 7eaf303a7a86..daeed31df622 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1172,9 +1172,7 @@ static void resize_console(struct port *port)
 
 	vdev = port->portdev->vdev;
 
-	/* Don't test F_SIZE at all if we're rproc: not a valid feature! */
-	if (!is_rproc_serial(vdev) &&
-	    virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
+	if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
 		hvc_resize(port->cons.hvc, port->cons.ws);
 }
 
@@ -1981,6 +1979,29 @@ static void virtcons_remove(struct virtio_device *vdev)
 	kfree(portdev);
 }
 
+static int virtcons_validate(struct virtio_device *vdev)
+{
+	if (is_rproc_serial(vdev)) {
+		/* Don't test F_SIZE at all if we're rproc: not a
+		 * valid feature! */
+		__virtio_clear_bit(vdev, VIRTIO_CONSOLE_F_SIZE);
+		/* Don't test MULTIPORT at all if we're rproc: not a
+		 * valid feature! */
+		__virtio_clear_bit(vdev, VIRTIO_CONSOLE_F_MULTIPORT);
+	}
+
+	/* We only need a config space if features are offered */
+	if (!vdev->config->get &&
+	    (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)
+	     || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) {
+		dev_err(&vdev->dev, "%s failure: config access disabled\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 /*
  * Once we're further in boot, we get probed like any other virtio
  * device.
@@ -1996,15 +2017,6 @@ static int virtcons_probe(struct virtio_device *vdev)
 	bool multiport;
 	bool early = early_put_chars != NULL;
 
-	/* We only need a config space if features are offered */
-	if (!vdev->config->get &&
-	    (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)
-	     || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) {
-		dev_err(&vdev->dev, "%s failure: config access disabled\n",
-			__func__);
-		return -EINVAL;
-	}
-
 	/* Ensure to read early_put_chars now */
 	barrier();
 
@@ -2031,9 +2043,7 @@ static int virtcons_probe(struct virtio_device *vdev)
 	multiport = false;
 	portdev->max_nr_ports = 1;
 
-	/* Don't test MULTIPORT at all if we're rproc: not a valid feature! */
-	if (!is_rproc_serial(vdev) &&
-	    virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
+	if (virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
 				 struct virtio_console_config, max_nr_ports,
 				 &portdev->max_nr_ports) == 0) {
 		multiport = true;
@@ -2210,6 +2220,7 @@ static struct virtio_driver virtio_console = {
 	.driver.name =	KBUILD_MODNAME,
 	.driver.owner =	THIS_MODULE,
 	.id_table =	id_table,
+	.validate = 	virtcons_validate,
 	.probe =	virtcons_probe,
 	.remove =	virtcons_remove,
 	.config_changed = config_intr,
-- 
2.25.1