Re: [PATCH] virtio: vdpa: omit check return of g_malloc

[Li Qiang <liq3ea@gmail.com>]

Philippe Mathieu-Daudé <philmd@redhat.com> 于2020年8月19日周三 下午11:07写道：
>
> On 8/19/20 4:43 PM, Li Qiang wrote:
> > If g_malloc fails, the application will be terminated.
>
> Which we don't want... better to use g_try_malloc() instead?

I don't think so. If g_malloc return NULL it means a critical
situation I think terminate the application
is OK. Though I don't find any rule/practices the qemu code base uses
g_malloc far more than
g_try_malloc.

Thanks,
Li Qiang

>
> > No need to check the return value of g_malloc.
> >
> > Signed-off-by: Li Qiang <liq3ea@163.com>
> > ---
> >  hw/virtio/vhost-vdpa.c | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> >
> > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> > index 4580f3efd8..403ae3ae07 100644
> > --- a/hw/virtio/vhost-vdpa.c
> > +++ b/hw/virtio/vhost-vdpa.c
> > @@ -320,10 +320,8 @@ static int vhost_vdpa_set_config(struct vhost_dev *dev, const uint8_t *data,
> >      struct vhost_vdpa_config *config;
> >      int ret;
> >      unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
> > +
> >      config = g_malloc(size + config_size);
> > -    if (config == NULL) {
> > -        return -1;
> > -    }
> >      config->off = offset;
> >      config->len = size;
> >      memcpy(config->buf, data, size);
> > @@ -340,9 +338,6 @@ static int vhost_vdpa_get_config(struct vhost_dev *dev, uint8_t *config,
> >      int ret;
> >
> >      v_config = g_malloc(config_len + config_size);
> > -    if (v_config == NULL) {
> > -        return -1;
> > -    }
> >      v_config->len = config_len;
> >      v_config->off = 0;
> >      ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_CONFIG, v_config);
> >
>