From: Nicolai Hähnle Date: Tue, 15 Mar 2016 17:56:45 +0000 (-0500) Subject: drm/radeon: hold reference to fences in radeon_sa_bo_new (3.17 and older) X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=af98a067c46b8e20a1e869072b6054a6c78aada0;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git drm/radeon: hold reference to fences in radeon_sa_bo_new (3.17 and older) [Backport of upstream commit f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb, with an additional NULL pointer guard that is required for kernels 3.17 and older. 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 Reviewed-by: Christian König (v1 + fix) Tested-by: Lutz Euler Signed-off-by: Greg Kroah-Hartman Signed-off-by: Willy Tarreau --- diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c index f0bac68254b..8962411b5f2 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 && block) {