FAILED: Patch "fpga: dfl: use subsys_initcall to allow built-in drivers to be added" failed to apply to 5.15-stable tree

FAILED: Patch "fpga: dfl: use subsys_initcall to allow built-in drivers to be added" failed to apply to 5.15-stable tree

[Sasha Levin]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 267f53140c9d0bf270bbe0148082e9b8e5011273 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Date: Mon, 15 Dec 2025 16:05:50 -0300
Subject: [PATCH] fpga: dfl: use subsys_initcall to allow built-in drivers to
 be added

The dfl code adds a bus. If it is built-in and there is a built-in driver
as well, the dfl module_init may be called after the driver module_init,
leading to a failure to register the driver as the bus has not been added
yet.

Use subsys_initcall, which guarantees it will be called before the drivers
init code.

Without the fix, we see failures like this:

[    0.479475] Driver 'intel-m10-bmc' was unable to register with bus_type 'dfl' because the bus was not initialized.

Cc: stable@vger.kernel.org
Fixes: 9ba3a0aa09fe ("fpga: dfl: create a dfl bus type to support DFL devices")
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Link: https://lore.kernel.org/r/20251215-dfl_subsys-v1-1-21807bad6b10@igalia.com
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
---
 drivers/fpga/dfl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 7022657243c0a..449c3a082e232 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -2018,7 +2018,7 @@ static void __exit dfl_fpga_exit(void)
 	bus_unregister(&dfl_bus_type);
 }
 
-module_init(dfl_fpga_init);
+subsys_initcall(dfl_fpga_init);
 module_exit(dfl_fpga_exit);
 
 MODULE_DESCRIPTION("FPGA Device Feature List (DFL) Support");
-- 
2.51.0