diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/4148-drm-amdkfd-Take-reference-to-gtt-usertask.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/4148-drm-amdkfd-Take-reference-to-gtt-usertask.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/4148-drm-amdkfd-Take-reference-to-gtt-usertask.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/4148-drm-amdkfd-Take-reference-to-gtt-usertask.patch new file mode 100644 index 00000000..a5c54077 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/4148-drm-amdkfd-Take-reference-to-gtt-usertask.patch @@ -0,0 +1,47 @@ +From 2f624615743214a059c25bde1525daac702c88d0 Mon Sep 17 00:00:00 2001 +From: Felix Kuehling <Felix.Kuehling@amd.com> +Date: Mon, 19 Mar 2018 16:01:16 -0400 +Subject: [PATCH 4148/5725] drm/amdkfd: Take reference to gtt->usertask + +Theoretically the task struct can be destroyed before the BO. Use +the task_struct's reference count to prevent that. + +Change-Id: I20f0c42c8f521347bc93987d0703db1f07696000 +Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> +Signed-off-by: Kalyan Alle <kalyan.alle@amd.com> +--- + drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 10 +++++++++- + 1 file changed, 9 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +index 71a5c67..6c81f2d 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +@@ -1024,6 +1024,9 @@ static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm) + { + struct amdgpu_ttm_tt *gtt = (void *)ttm; + ++ if (gtt->usertask) ++ put_task_struct(gtt->usertask); ++ + ttm_dma_tt_fini(>t->ttm); + kfree(gtt); + } +@@ -1112,8 +1115,13 @@ int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr, + return -EINVAL; + + gtt->userptr = addr; +- gtt->usertask = current->group_leader; + gtt->userflags = flags; ++ ++ if (gtt->usertask) ++ put_task_struct(gtt->usertask); ++ gtt->usertask = current->group_leader; ++ get_task_struct(gtt->usertask); ++ + spin_lock_init(>t->guptasklock); + INIT_LIST_HEAD(>t->guptasks); + atomic_set(>t->mmu_invalidations, 0); +-- +2.7.4 + |