FAILED: patch "[PATCH] HID: nintendo: register input device after capabilities are" failed to apply to 6.6-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.6-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>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x d723bc1fe2e72b9252234e94c11af644ec477bf7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026082526-entryway-slick-acd7@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From d723bc1fe2e72b9252234e94c11af644ec477bf7 Mon Sep 17 00:00:00 2001
From: Jiangshan Yi <yijiangshan@kylinos.cn>
Date: Thu, 30 Jul 2026 18:15:06 +0800
Subject: [PATCH] HID: nintendo: register input device after capabilities are
 set

input_register_device() exposes the device to userspace immediately.
In joycon_input_create() it was called before joycon_config_rumble()
configures the FF_RUMBLE capability and the memless force-feedback
device, so a concurrent EVIOCSFF could dereference a NULL dev->ff.

Registering early also means the initial udev event lacks button and
axis information, which can make input managers ignore the device.

Move input_register_device() to the end of joycon_input_create(), after
all capabilities, the IMU input device and the force-feedback callbacks
have been configured.

Fixes: 2af16c1f846b ("HID: nintendo: add nintendo switch controller driver")
Reported-by: sashiko-bot@kernel.org
Closes: https://sashiko.dev/#/patchset/20260730031927.25444-1-yijiangshan@kylinos.cn?part=1
Cc: stable@vger.kernel.org
Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn>
Link: https://sashiko.dev/#/patchset/20260730031927.25444-1-yijiangshan@kylinos.cn?part=1
Signed-off-by: Jiri Kosina <jkosina@suse.com>

diff --git a/drivers/hid/hid-nintendo.c b/drivers/hid/hid-nintendo.c
index 32eed94a7c8b..9df05bfdf580 100644
--- a/drivers/hid/hid-nintendo.c
+++ b/drivers/hid/hid-nintendo.c
@@ -2198,10 +2198,6 @@ static int joycon_input_create(struct joycon_ctlr *ctlr)
 	ctlr->input->phys = hdev->phys;
 	input_set_drvdata(ctlr->input, ctlr);
 
-	ret = input_register_device(ctlr->input);
-	if (ret)
-		return ret;
-
 	if (joycon_type_is_right_joycon(ctlr)) {
 		joycon_config_right_stick(ctlr->input);
 		joycon_config_buttons(ctlr->input, right_joycon_button_mappings);
@@ -2244,6 +2240,10 @@ static int joycon_input_create(struct joycon_ctlr *ctlr)
 	if (joycon_has_rumble(ctlr))
 		joycon_config_rumble(ctlr);
 
+	ret = input_register_device(ctlr->input);
+	if (ret)
+		return ret;
+
 	return 0;
 }