[git:media_stage/master] media: ipu-bridge: Serialise calls to IPU bridge init

[Hans Verkuil]

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Subject: media: ipu-bridge: Serialise calls to IPU bridge init
Author:  Sakari Ailus <sakari.ai...@linux.intel.com>
Date:    Tue Feb 13 11:42:30 2024 +0200

The IPU bridge initialisation will be called from multiple locations in
the future. Serialise the access to devices' fwnodes in this context.

Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>

 drivers/media/pci/intel/ipu-bridge.c | 4 ++++
 1 file changed, 4 insertions(+)

---

diff --git a/drivers/media/pci/intel/ipu-bridge.c 
b/drivers/media/pci/intel/ipu-bridge.c
index 735c62c37c22..e994db4f4d91 100644
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -766,6 +766,8 @@ static int ipu_bridge_check_fwnode_graph(struct 
fwnode_handle *fwnode)
        return ipu_bridge_check_fwnode_graph(fwnode->secondary);
 }
 
+static DEFINE_MUTEX(ipu_bridge_mutex);
+
 int ipu_bridge_init(struct device *dev,
                    ipu_parse_sensor_fwnode_t parse_sensor_fwnode)
 {
@@ -774,6 +776,8 @@ int ipu_bridge_init(struct device *dev,
        unsigned int i;
        int ret;
 
+       guard(mutex)(&ipu_bridge_mutex);
+
        if (!ipu_bridge_check_fwnode_graph(dev_fwnode(dev)))
                return 0;