linux-kernel - [PATCH V3 9/9] virtio: use WARN_ON() to warning illegal status value

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Date:   Mon, 25 Apr 2022 10:44:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     jasowang@...hat.com, mst@...hat.com, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     sgarzare@...hat.com, eperezma@...hat.com, lulu@...hat.com,
        tglx@...utronix.de, peterz@...radead.org, paulmck@...nel.org,
        maz@...nel.org, pasic@...ux.ibm.com, cohuck@...hat.com
Subject: [PATCH V3 9/9] virtio: use WARN_ON() to warning illegal status value

We used to use BUG_ON() in virtio_device_ready() to detect illegal
status value, this seems sub-optimal since the value is under the
control of the device. Switch to use WARN_ON() instead.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Halil Pasic <pasic@...ux.ibm.com>
Cc: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 include/linux/virtio_config.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 3e2bc8aff51e..b0010b2ca7c2 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -254,7 +254,7 @@ void virtio_device_ready(struct virtio_device *dev)
 {
 	unsigned status = dev->config->get_status(dev);
 
-	BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
+	WARN_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
 
 	/*
 	 * The virtio_synchronize_cbs() makes sure vring_interrupt()
-- 
2.25.1