[PATCH] drm/amdgpu: fix NULL pointer dereference when run App with DRI_PRIME=1

[Junwei Zhang]

[  632.679861] BUG: unable to handle kernel NULL pointer dereference at (null)
[  632.679892] IP: drm_prime_sg_to_page_addr_arrays+0x52/0xb0 [drm]
<snip>
[  632.680011] Call Trace:
[  632.680082]  amdgpu_ttm_tt_populate+0x3e/0xa0 [amdgpu]
[  632.680092]  ttm_tt_populate.part.7+0x22/0x60 [amdttm]
[  632.680098]  amdttm_tt_bind+0x52/0x60 [amdttm]
[  632.680106]  ttm_bo_handle_move_mem+0x54b/0x5c0 [amdttm]
[  632.680112]  ? find_next_bit+0xb/0x10
[  632.680119]  amdttm_bo_validate+0x11d/0x130 [amdttm]
[  632.680176]  amdgpu_cs_bo_validate+0x9d/0x150 [amdgpu]
[  632.680232]  amdgpu_cs_validate+0x41/0x270 [amdgpu]
[  632.680288]  amdgpu_cs_list_validate+0xc7/0x1a0 [amdgpu]
[  632.680343]  amdgpu_cs_ioctl+0x1634/0x1c00 [amdgpu]
[  632.680401]  ? amdgpu_cs_find_mapping+0x120/0x120 [amdgpu]
[  632.680416]  drm_ioctl_kernel+0x6b/0xb0 [drm]
[  632.680431]  drm_ioctl+0x3e4/0x450 [drm]
[  632.680485]  ? amdgpu_cs_find_mapping+0x120/0x120 [amdgpu]
[  632.680537]  amdgpu_drm_ioctl+0x4c/0x80 [amdgpu]
[  632.680542]  do_vfs_ioctl+0xa4/0x600
[  632.680546]  ? SyS_futex+0x7f/0x180
[  632.680549]  SyS_ioctl+0x79/0x90
[  632.680554]  entry_SYSCALL_64_fastpath+0x24/0xab

Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 57d4da6..b293809 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1212,7 +1212,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
 	gtt->ttm.ttm.func = &amdgpu_backend_func;
 
 	/* allocate space for the uninitialized page entries */
-	if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags)) {
+	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
-- 
1.9.1