linux-kernel - [PATCH] Bluetooth: constify the struct device

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Message-Id: <20240219-device_cleanup-bluetooth-v1-1-dd81ba00c95e@marliere.net>
Date: Mon, 19 Feb 2024 16:46:57 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Marcel Holtmann <marcel@...tmann.org>, 
 Johan Hedberg <johan.hedberg@...il.com>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] Bluetooth: constify the struct device_type usage

Since commit aed65af1cc2f ("drivers: make device_type const"), the driver
core can properly handle constant struct device_type. Move the bt_type and
bnep_type variables to be constant structures as well, placing it into
read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 net/bluetooth/6lowpan.c   | 2 +-
 net/bluetooth/bnep/core.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 215af9b3b589..5c1b8b5bfe71 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -572,7 +572,7 @@ static void netdev_setup(struct net_device *dev)
 	dev->needs_free_netdev	= true;
 }

-static struct device_type bt_type = {
+static const struct device_type bt_type = {
 	.name	= "bluetooth",
 };

diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index 5a6a49885ab6..8c3f8d0c0358 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -549,7 +549,7 @@ static struct device *bnep_get_device(struct bnep_session *session)
 	return &conn->hcon->dev;
 }

-static struct device_type bnep_type = {
+static const struct device_type bnep_type = {
 	.name	= "bluetooth",
 };

---
base-commit: 64b5c4c8e79c131fe8f135bab5e5dfaa245c5776
change-id: 20240219-device_cleanup-bluetooth-0a01f6ca4752

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>