According to virtio spec, the device MUST reset when 0 is written to
device_status, and present a 0 in device_status once that is done.
This patch adds the missing part of waiting status 0 in reset function.
Signed-off-by: Xueming Li <xuemi...@nvidia.com>
---
drivers/net/virtio/virtio.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/virtio.c b/drivers/net/virtio/virtio.c
index 7e1e77797f..f003f612d6 100644
--- a/drivers/net/virtio/virtio.c
+++ b/drivers/net/virtio/virtio.c
@@ -3,6 +3,8 @@
* Copyright(c) 2020 Red Hat, Inc.
*/
+#include <unistd.h>
+
#include "virtio.h"
uint64_t
@@ -39,8 +41,9 @@ void
virtio_reset(struct virtio_hw *hw)
{
VIRTIO_OPS(hw)->set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
- /* flush status write */
- VIRTIO_OPS(hw)->get_status(hw);
+ /* Flush status write and wait device ready. */
+ while (VIRTIO_OPS(hw)->get_status(hw) != VIRTIO_CONFIG_STATUS_RESET)
+ usleep(1000L);
}
void
--
2.25.1
