On Tue, Mar 15, 2016 at 12:56:45PM -0500, Nicolai Hähnle wrote:
> From: Nicolai Hähnle <nicolai.haehnle@xxxxxxx>
>
> [Backport of upstream commit f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb, with
> an additional NULL pointer guard that is required for kernels 3.17 and older.
>
Thank you, Nicolai. I'll queue this backport for the 3.16.
Cheers,
--
Luís
> To be precise, any kernel that does *not* have commit 954605ca3 "drm/radeon:
> use common fence implementation for fences, v4" requires this additional
> NULL pointer guard.]
>
> An arbitrary amount of time can pass between spin_unlock and
> radeon_fence_wait_any, so we need to ensure that nobody frees the
> fences from under us.
>
> Based on the analogous fix for amdgpu.
>
> Signed-off-by: Nicolai Hähnle <nicolai.haehnle@xxxxxxx>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx> (v1 + fix)
> Tested-by: Lutz Euler <lutz.euler@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/gpu/drm/radeon/radeon_sa.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
> index c507896..7d11901 100644
> --- a/drivers/gpu/drm/radeon/radeon_sa.c
> +++ b/drivers/gpu/drm/radeon/radeon_sa.c
> @@ -349,8 +349,15 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
> /* see if we can skip over some allocations */
> } while (radeon_sa_bo_next_hole(sa_manager, fences, tries));
>
> + for (i = 0; i < RADEON_NUM_RINGS; ++i) {
> + if (fences[i])
> + radeon_fence_ref(fences[i]);
> + }
> +
> spin_unlock(&sa_manager->wq.lock);
> r = radeon_fence_wait_any(rdev, fences, false);
> + for (i = 0; i < RADEON_NUM_RINGS; ++i)
> + radeon_fence_unref(&fences[i]);
> spin_lock(&sa_manager->wq.lock);
> /* if we have nothing to wait for block */
> if (r == -ENOENT) {
> --
> 2.5.0
>
> --
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