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Re: [Qemu-devel] [PATCH for-2.9 v2] virtio: Fix error handling in virtio
From: |
Andrew Jones |
Subject: |
Re: [Qemu-devel] [PATCH for-2.9 v2] virtio: Fix error handling in virtio_bus_device_plugged |
Date: |
Fri, 17 Mar 2017 13:42:39 +0100 |
User-agent: |
Mutt/1.6.0.1 (2016-04-01) |
On Fri, Mar 17, 2017 at 08:32:42PM +0800, Fam Zheng wrote:
> For one thing we shouldn't continue if an error happened, for the other
> two steps failing can cause an abort() in error_setg because we reuse
> the same errp blindly.
>
> Add error handling checks to fix both issues.
>
> Signed-off-by: Fam Zheng <address@hidden>
>
> ---
>
> v2: Don't forget the last errp -> &local_err. [Drew]
> ---
> hw/virtio/virtio-bus.c | 20 +++++++++++++++++---
> 1 file changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
> index a886011..3042232 100644
> --- a/hw/virtio/virtio-bus.c
> +++ b/hw/virtio/virtio-bus.c
> @@ -25,6 +25,7 @@
> #include "qemu/osdep.h"
> #include "hw/hw.h"
> #include "qemu/error-report.h"
> +#include "qapi/error.h"
> #include "hw/qdev.h"
> #include "hw/virtio/virtio-bus.h"
> #include "hw/virtio/virtio.h"
> @@ -48,20 +49,33 @@ void virtio_bus_device_plugged(VirtIODevice *vdev, Error
> **errp)
> VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
> VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
> bool has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
> + Error *local_err = NULL;
>
> DPRINTF("%s: plug device.\n", qbus->name);
>
> if (klass->pre_plugged != NULL) {
> - klass->pre_plugged(qbus->parent, errp);
> + klass->pre_plugged(qbus->parent, &local_err);
> + if (local_err) {
> + error_propagate(errp, local_err);
> + return;
> + }
> }
>
> /* Get the features of the plugged device. */
> assert(vdc->get_features != NULL);
> vdev->host_features = vdc->get_features(vdev, vdev->host_features,
> - errp);
> + &local_err);
> + if (local_err) {
> + error_propagate(errp, local_err);
> + return;
> + }
>
> if (klass->device_plugged != NULL) {
> - klass->device_plugged(qbus->parent, errp);
> + klass->device_plugged(qbus->parent, &local_err);
> + }
> + if (local_err) {
> + error_propagate(errp, local_err);
> + return;
> }
>
> if (klass->get_dma_as != NULL && has_iommu) {
> --
> 2.9.3
>
>
Reviewed-by: Andrew Jones <address@hidden>