linux-kernel - [PATCH v5 3/6] kernel/reboot: add device to sys_off

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Date:   Tue, 18 Apr 2023 13:10:02 +0200
From:   Benjamin Bara <bbara93@...il.com>
To:     Wolfram Sang <wsa@...nel.org>, Lee Jones <lee@...nel.org>,
        rafael.j.wysocki@...el.com
Cc:     dmitry.osipenko@...labora.com, peterz@...radead.org,
        jonathanh@...dia.com, richard.leitner@...ux.dev,
        treding@...dia.com, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        Benjamin Bara <benjamin.bara@...data.com>
Subject: [PATCH v5 3/6] kernel/reboot: add device to sys_off_handler

From: Benjamin Bara <benjamin.bara@...data.com>

If the dev is known (e.g. a devm-based sys_off_handler is used), it can
be passed to the handler's callback to have it available there.
Otherwise, cb_data might be set to the dev in most of the cases.

Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
---
 include/linux/reboot.h | 3 +++
 kernel/reboot.c        | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 2b6bb593be5b..c4cc3b89ced1 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -129,11 +129,14 @@ enum sys_off_mode {
  * @cb_data: User's callback data.
  * @cmd: Command string. Currently used only by the sys-off restart mode,
  *       NULL otherwise.
+ * @dev: Device of the sys-off handler. Only if known (devm_register_*),
+ *       NULL otherwise.
  */
 struct sys_off_data {
 	int mode;
 	void *cb_data;
 	const char *cmd;
+	struct device *dev;
 };
 
 struct sys_off_handler *
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 6ebef11c8876..395a0ea3c7a8 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -55,6 +55,7 @@ struct sys_off_handler {
 	enum sys_off_mode mode;
 	bool blocking;
 	void *list;
+	struct device *dev;
 };
 
 /*
@@ -324,6 +325,7 @@ static int sys_off_notify(struct notifier_block *nb,
 	data.cb_data = handler->cb_data;
 	data.mode = mode;
 	data.cmd = cmd;
+	data.dev = handler->dev;
 
 	return handler->sys_off_cb(&data);
 }
@@ -511,6 +513,7 @@ int devm_register_sys_off_handler(struct device *dev,
 	handler = register_sys_off_handler(mode, priority, callback, cb_data);
 	if (IS_ERR(handler))
 		return PTR_ERR(handler);
+	handler->dev = dev;
 
 	return devm_add_action_or_reset(dev, devm_unregister_sys_off_handler,
 					handler);

-- 
2.34.1