gpu: nvgpu: Fix some GPU boot error paths

Fix panics in error path when FECS cannot be booted.

Change-Id: I354e37579386e27f46b80cd4172fe12897a3b92f
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/712698

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
index 0d5f32dd..313962a1 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
+++ b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
@@ -78,10 +78,17 @@ static int gk20a_tegra_secure_page_alloc(struct platform_device *pdev)
 static void gk20a_tegra_secure_destroy(struct platform_device *pdev,
                                        struct gr_ctx_buffer_desc *desc)
 {
-        gk20a_free_sgtable(&desc->sgt);
-        dma_free_attrs(&tegra_vpr_dev, desc->size,
+        if (desc->sgt) {
+                gk20a_free_sgtable(&desc->sgt);
+                desc->sgt = NULL;
+        }
+
+        if (desc->iova) {
+                dma_free_attrs(&tegra_vpr_dev, desc->size,
                         (void *)(uintptr_t)desc->iova,
                         desc->iova, &desc->attrs);
+                desc->iova = 0;
+        }
 }
 
 static int gk20a_tegra_secure_alloc(struct platform_device *pdev,