linux-kernel - [PATCH] um: virt-pci: set device ready in probe()

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Date:   Fri, 10 Jun 2022 17:12:03 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>
CC:     <kernel@...s.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        <linux-um@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] um: virt-pci: set device ready in probe()

Call virtio_device_ready() to make this driver work after commit
b4ec69d7e09 ("virtio: harden vring IRQ"), since the driver uses the
virtqueues in the probe function.  (The virtio core sets the device
ready when probe returns.)

Fixes: 8b4ec69d7e09 ("virtio: harden vring IRQ")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 arch/um/drivers/virt-pci.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index 5c092a9153ea..027847023184 100644
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -544,6 +544,8 @@ static int um_pci_init_vqs(struct um_pci_device *dev)
 	dev->cmd_vq = vqs[0];
 	dev->irq_vq = vqs[1];
 
+	virtio_device_ready(dev->vdev);
+
 	for (i = 0; i < NUM_IRQ_MSGS; i++) {
 		void *msg = kzalloc(MAX_IRQ_MSG_SIZE, GFP_KERNEL);
 
@@ -587,7 +589,7 @@ static int um_pci_virtio_probe(struct virtio_device *vdev)
 	dev->irq = irq_alloc_desc(numa_node_id());
 	if (dev->irq < 0) {
 		err = dev->irq;
-		goto error;
+		goto err_reset;
 	}
 	um_pci_devices[free].dev = dev;
 	vdev->priv = dev;
@@ -604,6 +606,9 @@ static int um_pci_virtio_probe(struct virtio_device *vdev)
 
 	um_pci_rescan();
 	return 0;
+err_reset:
+	virtio_reset_device(vdev);
+	vdev->config->del_vqs(vdev);
 error:
 	mutex_unlock(&um_pci_mtx);
 	kfree(dev);
-- 
2.34.1