From 9764723de613d93b72e95923d25d589f539f07e9 Mon Sep 17 00:00:00 2001
From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Fri, 1 Sep 2023 14:15:07 +0300
Subject: gpu: host1x: Add locking in channel allocation

Add locking around channel allocation to avoid race conditions.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901111510.663401-1-cyndis@kapsi.fi
---
 drivers/gpu/host1x/channel.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/gpu/host1x/channel.h')

diff --git a/drivers/gpu/host1x/channel.h b/drivers/gpu/host1x/channel.h
index 39044ff6c3aa..b23a8071fbd0 100644
--- a/drivers/gpu/host1x/channel.h
+++ b/drivers/gpu/host1x/channel.h
@@ -10,6 +10,7 @@
 
 #include <linux/io.h>
 #include <linux/kref.h>
+#include <linux/mutex.h>
 
 #include "cdma.h"
 
@@ -18,6 +19,8 @@ struct host1x_channel;
 
 struct host1x_channel_list {
 	struct host1x_channel *channels;
+
+	struct mutex lock;
 	unsigned long *allocated_channels;
 };
 
-- 
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