Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210321151907.367586-1-ztong0001@gmail.com> <259c234f-ca6a-7f9a-8df1-69055f2fc1b6@amd.com>
In-Reply-To: <259c234f-ca6a-7f9a-8df1-69055f2fc1b6@amd.com>
From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Tue, 23 Mar 2021 10:45:31 -0400
Message-ID: <CADnq5_Njn4SxzhLOc6rUwFv1b0AsSmP7-KWONBuxiGMaQ-FpLg@mail.gmail.com>
Subject: Re: [PATCH v2] drm/radeon: don't evict if not initialized
To:     =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>
Cc:     Tong Zhang <ztong0001@gmail.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

Applied.  Thanks!

Alex

On Mon, Mar 22, 2021 at 3:40 AM Christian K=C3=B6nig
<christian.koenig@amd.com> wrote:
>
> Am 21.03.21 um 16:19 schrieb Tong Zhang:
> > TTM_PL_VRAM may not initialized at all when calling
> > radeon_bo_evict_vram(). We need to check before doing eviction.
> >
> > [    2.160837] BUG: kernel NULL pointer dereference, address: 000000000=
0000020
> > [    2.161212] #PF: supervisor read access in kernel mode
> > [    2.161490] #PF: error_code(0x0000) - not-present page
> > [    2.161767] PGD 0 P4D 0
> > [    2.163088] RIP: 0010:ttm_resource_manager_evict_all+0x70/0x1c0 [ttm=
]
> > [    2.168506] Call Trace:
> > [    2.168641]  radeon_bo_evict_vram+0x1c/0x20 [radeon]
> > [    2.168936]  radeon_device_fini+0x28/0xf9 [radeon]
> > [    2.169224]  radeon_driver_unload_kms+0x44/0xa0 [radeon]
> > [    2.169534]  radeon_driver_load_kms+0x174/0x210 [radeon]
> > [    2.169843]  drm_dev_register+0xd9/0x1c0 [drm]
> > [    2.170104]  radeon_pci_probe+0x117/0x1a0 [radeon]
> >
> > Suggested-by: Christian K=C3=B6nig <christian.koenig@amd.com>
> > Signed-off-by: Tong Zhang <ztong0001@gmail.com>
>
> Reviewed-by: Christian K=C3=B6nig <christian.koenig@amd.com>
>
> > ---
> > v2: coding style fix
> >
> >   drivers/gpu/drm/radeon/radeon_object.c | 2 ++
> >   1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/r=
adeon/radeon_object.c
> > index 9b81786782de..499ce55e34cc 100644
> > --- a/drivers/gpu/drm/radeon/radeon_object.c
> > +++ b/drivers/gpu/drm/radeon/radeon_object.c
> > @@ -384,6 +384,8 @@ int radeon_bo_evict_vram(struct radeon_device *rdev=
)
> >       }
> >   #endif
> >       man =3D ttm_manager_type(bdev, TTM_PL_VRAM);
> > +     if (!man)
> > +             return 0;
> >       return ttm_resource_manager_evict_all(bdev, man);
> >   }
> >
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx