[PATCH] virtio: i2c: Check notifier helpers for VIRTIO_CONFIG_IRQ_IDX

[Viresh Kumar]

Since the driver doesn't support interrupts, we must return early when
index is set to VIRTIO_CONFIG_IRQ_IDX.

Fixes: 544f0278afca ("virtio: introduce macro VIRTIO_CONFIG_IRQ_IDX")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 hw/virtio/vhost-user-i2c.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hw/virtio/vhost-user-i2c.c b/hw/virtio/vhost-user-i2c.c
index 60eaf0d95be0..45100a24953c 100644
--- a/hw/virtio/vhost-user-i2c.c
+++ b/hw/virtio/vhost-user-i2c.c
@@ -128,6 +128,16 @@ static void vu_i2c_guest_notifier_mask(VirtIODevice *vdev, 
int idx, bool mask)
 {
     VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
 
+    /*
+     * Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
+     * as the Marco of configure interrupt's IDX, If this driver does not
+     * support, the function will return
+     */
+
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return;
+    }
+
     vhost_virtqueue_mask(&i2c->vhost_dev, vdev, idx, mask);
 }
 
@@ -135,6 +145,16 @@ static bool vu_i2c_guest_notifier_pending(VirtIODevice 
*vdev, int idx)
 {
     VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
 
+    /*
+     * Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
+     * as the Marco of configure interrupt's IDX, If this driver does not
+     * support, the function will return
+     */
+
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return false;
+    }
+
     return vhost_virtqueue_pending(&i2c->vhost_dev, idx);
 }
 
-- 
2.31.1.272.g89b43f80a514