From dc70eb868b9cd2ca01313e5a394e6ea001d513e9 Mon Sep 17 00:00:00 2001 From: Alexis Lothoré Date: Tue, 4 Apr 2023 15:31:02 +0200 Subject: fpga: bridge: properly initialize bridge device before populating children MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Acked-by: Xu Yilun Link: https://lore.kernel.org/r/20230404133102.2837535-2-alexis.lothore@bootlin.com Signed-off-by: Xu Yilun --- drivers/fpga/fpga-bridge.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/fpga') diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c index 5cd40acab5bf..0953e6e4db04 100644 --- 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: -- cgit v1.2.3