add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/nvmem.c
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@@ -1,17 +1,15 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * RTC subsystem, nvmem interface
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  *
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  * Copyright (C) 2017 Alexandre Belloni
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/err.h>
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 #include <linux/types.h>
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 #include <linux/nvmem-consumer.h>
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 #include <linux/rtc.h>
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+#include <linux/slab.h>
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 #include <linux/sysfs.h>
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14
 
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 /*
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@@ -25,11 +23,9 @@
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 	       struct bin_attribute *attr,
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 	       char *buf, loff_t off, size_t count)
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 {
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-	struct rtc_device *rtc = attr->private;
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-
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 	dev_warn_once(kobj_to_dev(kobj), nvram_warning);
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-	return nvmem_device_read(rtc->nvmem, off, count, buf);
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+	return nvmem_device_read(attr->private, off, count, buf);
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 }
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 static ssize_t
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@@ -37,26 +33,23 @@
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 		struct bin_attribute *attr,
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 		char *buf, loff_t off, size_t count)
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 {
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-	struct rtc_device *rtc = attr->private;
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-
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 	dev_warn_once(kobj_to_dev(kobj), nvram_warning);
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-	return nvmem_device_write(rtc->nvmem, off, count, buf);
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+	return nvmem_device_write(attr->private, off, count, buf);
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 }
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-static int rtc_nvram_register(struct rtc_device *rtc, size_t size)
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+static int rtc_nvram_register(struct rtc_device *rtc,
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+			      struct nvmem_device *nvmem, size_t size)
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 {
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 	int err;
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-	rtc->nvram = devm_kzalloc(rtc->dev.parent,
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-				sizeof(struct bin_attribute),
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-				GFP_KERNEL);
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+	rtc->nvram = kzalloc(sizeof(*rtc->nvram), GFP_KERNEL);
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 	if (!rtc->nvram)
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 		return -ENOMEM;
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 	rtc->nvram->attr.name = "nvram";
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 	rtc->nvram->attr.mode = 0644;
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-	rtc->nvram->private = rtc;
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+	rtc->nvram->private = nvmem;
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 	sysfs_bin_attr_init(rtc->nvram);
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@@ -67,7 +60,7 @@
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 	err = sysfs_create_bin_file(&rtc->dev.parent->kobj,
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 				    rtc->nvram);
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 	if (err) {
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-		devm_kfree(rtc->dev.parent, rtc->nvram);
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+		kfree(rtc->nvram);
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 		rtc->nvram = NULL;
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 	}
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@@ -77,6 +70,8 @@
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 static void rtc_nvram_unregister(struct rtc_device *rtc)
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 {
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 	sysfs_remove_bin_file(&rtc->dev.parent->kobj, rtc->nvram);
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+	kfree(rtc->nvram);
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+	rtc->nvram = NULL;
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 }
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 /*
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@@ -85,21 +80,20 @@
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 int rtc_nvmem_register(struct rtc_device *rtc,
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 		       struct nvmem_config *nvmem_config)
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 {
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-	if (!IS_ERR_OR_NULL(rtc->nvmem))
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-		return -EBUSY;
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+	struct nvmem_device *nvmem;
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 	if (!nvmem_config)
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 		return -ENODEV;
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 	nvmem_config->dev = rtc->dev.parent;
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 	nvmem_config->owner = rtc->owner;
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-	rtc->nvmem = nvmem_register(nvmem_config);
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-	if (IS_ERR(rtc->nvmem))
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-		return PTR_ERR(rtc->nvmem);
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+	nvmem = devm_nvmem_register(rtc->dev.parent, nvmem_config);
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+	if (IS_ERR(nvmem))
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+		return PTR_ERR(nvmem);
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 	/* Register the old ABI */
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 	if (rtc->nvram_old_abi)
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-		rtc_nvram_register(rtc, nvmem_config->size);
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+		rtc_nvram_register(rtc, nvmem, nvmem_config->size);
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 	return 0;
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 }
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@@ -107,12 +101,7 @@
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 void rtc_nvmem_unregister(struct rtc_device *rtc)
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 {
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-	if (IS_ERR_OR_NULL(rtc->nvmem))
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-		return;
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-
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 	/* unregister the old ABI */
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 	if (rtc->nvram)
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 		rtc_nvram_unregister(rtc);
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-
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-	nvmem_unregister(rtc->nvmem);
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 }