From: jeffy <jeffy.chen@rock-chips.com>
To: linux-kernel@vger.kernel.org, briannorris@chromium.org,
dianders@chromium.org, dri-devel@lists.freedesktop.org,
tfiga@chromium.org, linux-rockchip@lists.infradead.org,
zyw@rock-chips.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 8/9] drm/rockchip: gem: Don't alloc/free gem buf before drm dev registered
Date: Wed, 05 Apr 2017 09:28:17 +0800 [thread overview]
Message-ID: <58E44831.900@rock-chips.com> (raw)
In-Reply-To: <20170403074101.f3ykqpdphklwummz@phenom.ffwll.local>
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@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@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
next prev parent reply other threads:[~2017-04-05 1:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-01 11:35 [PATCH v2 0/9] drm: rockchip: Fix rockchip drm unbind crash error Jeffy Chen
2017-04-01 11:35 ` [PATCH v2 1/9] drm: bridge: analogix: Detach panel when unbinding analogix dp Jeffy Chen
2017-04-01 11:35 ` [PATCH v2 2/9] drm: bridge: analogix: Unregister dp aux when unbinding Jeffy Chen
2017-04-01 11:35 ` [PATCH v2 3/9] drm: bridge: analogix: Destroy connector " Jeffy Chen
2017-04-01 11:35 ` [PATCH v2 4/9] drm/rockchip: cdn-dp: Don't try to release firmware when not loaded Jeffy Chen
2017-04-01 11:35 ` [PATCH v2 5/9] drm/rockchip: vop: Enable pm domain when resetting vop Jeffy Chen
2017-04-04 19:42 ` Sean Paul
2017-04-05 10:23 ` jeffy
2017-04-01 11:35 ` [PATCH v2 6/9] drm/rockchip: Reoder unload sequence Jeffy Chen
2017-04-04 19:44 ` Sean Paul
2017-04-05 10:20 ` jeffy
2017-04-01 11:35 ` [PATCH v2 7/9] drm/rockchip: Force disable all crtc when unload Jeffy Chen
2017-04-03 7:58 ` Daniel Vetter
2017-04-05 10:25 ` jeffy
2017-04-01 11:35 ` [PATCH v2 8/9] drm/rockchip: gem: Don't alloc/free gem buf before drm dev registered Jeffy Chen
2017-04-03 7:41 ` Daniel Vetter
2017-04-05 1:28 ` jeffy [this message]
2017-04-01 11:35 ` [PATCH v2 9/9] drm/rockchip: cdn-dp: Don't unregister audio dev when unbinding Jeffy Chen
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