From 8d68e687f029b3ed85737bec768438e6156a89d9 Mon Sep 17 00:00:00 2001
From: Richard Zhao <rizhao@nvidia.com>
Date: Fri, 22 May 2020 18:47:06 -0700
Subject: [PATCH] gpu: nvgpu: linux: check whether hal initialized for
 gr_default_attrib_cb_size

On access debugfs node gr_default_attrib_cb_size, the hal might not have
been initialized.

Bug 2848790

Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Change-Id: I0a70f1377d2001802092a8eccec5ec144a58c79b
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2349299
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
---
 drivers/gpu/nvgpu/os/linux/debug_gr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/nvgpu/os/linux/debug_gr.c b/drivers/gpu/nvgpu/os/linux/debug_gr.c
index 750d16666..28d241b0f 100644
--- a/drivers/gpu/nvgpu/os/linux/debug_gr.c
+++ b/drivers/gpu/nvgpu/os/linux/debug_gr.c
@@ -28,6 +28,10 @@ static int gr_default_attrib_cb_size_show(struct seq_file *s, void *data)
 {
 	struct gk20a *g = s->private;
 
+	/* HAL might not be initialized yet */
+	if (g->ops.gr.init.get_attrib_cb_default_size == NULL)
+		return -EFAULT;
+
 	seq_printf(s, "%u\n", g->ops.gr.init.get_attrib_cb_default_size(g));
 
 	return 0;