fpga: bridge: properly initialize bridge device before populating children

The current code path can lead to warnings because of uninitialized device,
which contains, as a consequence, uninitialized kobject. The uninitialized
device is passed to of_platform_populate, which will at some point, while
creating child device, try to get a reference on uninitialized parent,
resulting in the following warning:

kobject: '(null)' ((ptrval)): is not initialized, yet kobject_get() is
being called.

The warning is observed after migrating a kernel 5.10.x to 6.1.x.
Reverting commit 0d70af3c2530 ("fpga: bridge: Use standard dev_release for
class driver") seems to remove the warning.
This commit aggregates device_initialize() and device_add() into
device_register() but this new call is done AFTER of_platform_populate

Fixes: 0d70af3c2530 ("fpga: bridge: Use standard dev_release for class driver")
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230404133102.2837535-2-alexis.lothore@bootlin.com
Signed-off-by: Xu Yilun <yilun.xu@intel.com>

diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
index 5cd40ac..0953e6e 100644 (file)
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -363,7 +363,6 @@ fpga_bridge_register(struct device *parent, const char *name,
        bridge->dev.parent = parent;
        bridge->dev.of_node = parent->of_node;
        bridge->dev.id = id;
-       of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);
 
        ret = dev_set_name(&bridge->dev, "br%d", id);
        if (ret)
@@ -375,6 +374,8 @@ fpga_bridge_register(struct device *parent, const char *name,
                return ERR_PTR(ret);
        }
 
+       of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);
+
        return bridge;
 
 error_device: