From: Jason Wang <jasowang@xxxxxxxxxx>
virtio-rng: make device ready before making request
Current virtio-rng does a entropy request before DRIVER_OK, this
violates the spec:
virtio spec requires that all drivers set DRIVER_OK
before using devices.
Further, kernel will ignore the interrupt after commit
8b4ec69d7e09 ("virtio: harden vring IRQ").
Fixing this by making device ready before the request.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 8b4ec69d7e09 ("virtio: harden vring IRQ")
Fixes: f7f510ec1957 ("virtio: An entropy device, as suggested by hpa.")
Reported-and-tested-by: syzbot+5b59d6d459306a556f54@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Message-Id: <20220608061422.38437-1-jasowang@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Reviewed-by: Laurent Vivier <lvivier@xxxxxxxxxx>
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index blahblah..blahblah 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -159,6 +159,8 @@ static int probe_common(struct virtio_device *vdev)
goto err_find;
}
+ virtio_device_ready(vdev);
+
/* we always have a pending entropy request */
request_entropy(vi);
--
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1861
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