* [PATCH] vduse: Cleanup the old kernel states after reset failure
@ 2021-09-06 14:21 Xie Yongji
2021-09-07 3:33 ` Jason Wang
0 siblings, 1 reply; 2+ messages in thread
From: Xie Yongji @ 2021-09-06 14:21 UTC (permalink / raw)
To: mst, jasowang; +Cc: virtualization, linux-kernel
We should cleanup the old kernel states e.g. interrupt callback
no matter whether the userspace handle the reset correctly or not
since virtio-vdpa can't handle the reset failure now.
Otherwise, the old state might be used after reset which might
break something, e.g. the old interrupt callback might be triggered
by userspace after reset, which can break the virtio device driver.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
drivers/vdpa/vdpa_user/vduse_dev.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 59a93e5b967a..61695521066c 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -665,13 +665,11 @@ static void vduse_vdpa_set_config(struct vdpa_device *vdpa, unsigned int offset,
static int vduse_vdpa_reset(struct vdpa_device *vdpa)
{
struct vduse_dev *dev = vdpa_to_vduse(vdpa);
-
- if (vduse_dev_set_status(dev, 0))
- return -EIO;
+ int ret = vduse_dev_set_status(dev, 0);
vduse_dev_reset(dev);
- return 0;
+ return ret;
}
static u32 vduse_vdpa_get_generation(struct vdpa_device *vdpa)
--
2.11.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] vduse: Cleanup the old kernel states after reset failure
2021-09-06 14:21 [PATCH] vduse: Cleanup the old kernel states after reset failure Xie Yongji
@ 2021-09-07 3:33 ` Jason Wang
0 siblings, 0 replies; 2+ messages in thread
From: Jason Wang @ 2021-09-07 3:33 UTC (permalink / raw)
To: Xie Yongji; +Cc: mst, virtualization, linux-kernel
On Mon, Sep 6, 2021 at 10:22 PM Xie Yongji <xieyongji@bytedance.com> wrote:
>
> We should cleanup the old kernel states e.g. interrupt callback
> no matter whether the userspace handle the reset correctly or not
> since virtio-vdpa can't handle the reset failure now.
>
> Otherwise, the old state might be used after reset which might
> break something, e.g. the old interrupt callback might be triggered
> by userspace after reset, which can break the virtio device driver.
>
> Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
> ---
> drivers/vdpa/vdpa_user/vduse_dev.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 59a93e5b967a..61695521066c 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -665,13 +665,11 @@ static void vduse_vdpa_set_config(struct vdpa_device *vdpa, unsigned int offset,
> static int vduse_vdpa_reset(struct vdpa_device *vdpa)
> {
> struct vduse_dev *dev = vdpa_to_vduse(vdpa);
> -
> - if (vduse_dev_set_status(dev, 0))
> - return -EIO;
> + int ret = vduse_dev_set_status(dev, 0);
>
> vduse_dev_reset(dev);
>
> - return 0;
> + return ret;
> }
>
> static u32 vduse_vdpa_get_generation(struct vdpa_device *vdpa)
> --
> 2.11.0
>
Acked-by: Jason Wang <jasowang@redhat.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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