linux-kernel - [PATCH] soc: apple: rtkit: Export non-devm init/free functions

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Message-Id: <20230121074135.8629-1-lina@asahilina.net>
Date:   Sat, 21 Jan 2023 16:41:35 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Asahi Lina <lina@...hilina.net>
Subject: [PATCH] soc: apple: rtkit: Export non-devm init/free functions

While we normally encourage devm usage by drivers, some consumers (and
in particular the upcoming Rust abstractions) might want to manually
manage memory. Export the raw functions to make this possible.

Signed-off-by: Asahi Lina <lina@...hilina.net>
---
 drivers/soc/apple/rtkit.c       | 15 ++++++++++-----
 include/linux/soc/apple/rtkit.h | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index fa3cda831d2b..bb33f3cd4efd 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -686,7 +686,7 @@ static int apple_rtkit_request_mbox_chan(struct apple_rtkit *rtk)
 	return mbox_start_channel(rtk->mbox_chan);
 }
 
-static struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
+struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
 					    const char *mbox_name, int mbox_idx,
 					    const struct apple_rtkit_ops *ops)
 {
@@ -739,6 +739,7 @@ static struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
 	kfree(rtk);
 	return ERR_PTR(ret);
 }
+EXPORT_SYMBOL_GPL(apple_rtkit_init);
 
 static int apple_rtkit_wait_for_completion(struct completion *c)
 {
@@ -922,10 +923,8 @@ int apple_rtkit_wake(struct apple_rtkit *rtk)
 }
 EXPORT_SYMBOL_GPL(apple_rtkit_wake);
 
-static void apple_rtkit_free(void *data)
+void apple_rtkit_free(struct apple_rtkit *rtk)
 {
-	struct apple_rtkit *rtk = data;
-
 	mbox_free_channel(rtk->mbox_chan);
 	destroy_workqueue(rtk->wq);
 
@@ -936,6 +935,12 @@ static void apple_rtkit_free(void *data)
 	kfree(rtk->syslog_msg_buffer);
 	kfree(rtk);
 }
+EXPORT_SYMBOL_GPL(apple_rtkit_free);
+
+static void apple_rtkit_free_wrapper(void *data)
+{
+	apple_rtkit_free(data);
+}
 
 struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
 					  const char *mbox_name, int mbox_idx,
@@ -948,7 +953,7 @@ struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
 	if (IS_ERR(rtk))
 		return rtk;
 
-	ret = devm_add_action_or_reset(dev, apple_rtkit_free, rtk);
+	ret = devm_add_action_or_reset(dev, apple_rtkit_free_wrapper, rtk);
 	if (ret)
 		return ERR_PTR(ret);
 
diff --git a/include/linux/soc/apple/rtkit.h b/include/linux/soc/apple/rtkit.h
index 2d837aa7b91f..62bfa37b5adb 100644
--- a/include/linux/soc/apple/rtkit.h
+++ b/include/linux/soc/apple/rtkit.h
@@ -77,6 +77,25 @@ struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
 					  const char *mbox_name, int mbox_idx,
 					  const struct apple_rtkit_ops *ops);
 
+/*
+ * Non-devm version of devm_apple_rtkit_init. Must be freed with
+ * apple_rtkit_free.
+ *
+ * @dev:         Pointer to the device node this coprocessor is assocated with
+ * @cookie:      opaque cookie passed to all functions defined in rtkit_ops
+ * @mbox_name:   mailbox name used to communicate with the co-processor
+ * @mbox_idx:    mailbox index to be used if mbox_name is NULL
+ * @ops:         pointer to rtkit_ops to be used for this co-processor
+ */
+struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
+					  const char *mbox_name, int mbox_idx,
+					  const struct apple_rtkit_ops *ops);
+
+/*
+ * Free an instance of apple_rtkit.
+ */
+void apple_rtkit_free(struct apple_rtkit *rtk);
+
 /*
  * Reinitialize internal structures. Must only be called with the co-processor
  * is held in reset.
-- 
2.35.1