Hi Daniel,
On 04/03/2017 03:41 PM, Daniel Vetter wrote:
> On Sat, Apr 01, 2017 at 07:35:28PM +0800, Jeffy Chen wrote:
>> Signed-off-by: Jeffy Chen <jeffy.chen at rock-chips.com>
>> ---
>>
>> Changes in v2: None
>
> Wut? How is this even possible? If you haven't registered the driver yet,
> there's no way for userspace to call allocation functions. Anything else
> is a driver bug that should be handled by fixing the driver load sequence.
> The only thing I can imagine is that you init the fbdev stuff too early,
> in that case pls fix that. Not apply this duct-tape here.
after unbind drm drivers, userspace may still have the chance to call
gem ioctls before we call drm_dev_register again. and we can add a
sanity check here to avoid invalid access.
i'll try to make a better commit message in next version soon, thanx for
reply.
>
> Thanks, Daniel
>
>>
>> drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> index df9e570..2bf8024 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
>> @@ -184,6 +184,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
>> struct drm_device *drm = obj->dev;
>> struct rockchip_drm_private *private = drm->dev_private;
>>
>> + if (!drm->registered)
>> + return -ENODEV;
>> +
>> if (private->domain)
>> return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
>> else
>> @@ -208,6 +211,11 @@ static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
>>
>> static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
>> {
>> + struct drm_device *drm = rk_obj->base.dev;
>> +
>> + if (!drm->registered)
>> + return;
>> +
>> if (rk_obj->pages)
>> rockchip_gem_free_iommu(rk_obj);
>> else
>> --
>> 2.1.4
>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
