From cbde6ba274002972377247da402080e310c23df8 Mon Sep 17 00:00:00 2001
From: Johnny Liu <johnliu@nvidia.com>
Date: Thu, 19 Oct 2023 07:25:22 +0000
Subject: [PATCH] gpu: host1x: NULL check before get_rate

Avoid calling get_rate function pointer when it is not supported by
the client driver.

Bug 4338396

Signed-off-by: Johnny Liu <johnliu@nvidia.com>
Change-Id: Iee7f26865d82235de7a5b41347546c1195a7ea48
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3000315
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
---
 drivers/gpu/host1x/actmon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/host1x/actmon.c b/drivers/gpu/host1x/actmon.c
index 51c22310..63974811 100644
--- a/drivers/gpu/host1x/actmon.c
+++ b/drivers/gpu/host1x/actmon.c
@@ -7,6 +7,7 @@
 
 #include <linux/clk.h>
 #include <linux/debugfs.h>
+#include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/host1x-next.h>
 
@@ -191,6 +192,9 @@ static int host1x_actmon_module_avg_norm_get(void *data, u64 *val)
 	unsigned long client_freq;
 	u32 active_clks, client_clks;
 
+	if (!client->ops->get_rate)
+		return -ENOTSUPP;
+
 	active_clks = actmon_module_readl(module, HOST1X_ACTMON_MODULE_AVG_COUNT_REG);
 
 	client_freq = client->ops->get_rate(client);