From 11001931afbc5efaf9bcdbb09e7265bc6ce27391 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <Uwe.Kleine-Koenig@digi.com>
Date: Thu, 21 Feb 2008 15:04:40 +0100
Subject: [PATCH] --- yaml --- r: 100693 b: refs/heads/master c:
 f7b0b939d54b457ba172e088f477af2012aef9b3 h: refs/heads/master i:   100691:
 6420b91949cd0b3f5724bfe8ce3898346c365a0e v: v3

---
 [refs]                        |  2 +-
 trunk/arch/arm/kernel/atags.c | 80 +++++++++++++++++------------------
 2 files changed, 40 insertions(+), 42 deletions(-)

diff --git a/[refs] b/[refs]
index d89065f7def5..203b6d233b17 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8ff7f2a46bd8831e1f1f2a694ec13921720180b7
+refs/heads/master: f7b0b939d54b457ba172e088f477af2012aef9b3
diff --git a/trunk/arch/arm/kernel/atags.c b/trunk/arch/arm/kernel/atags.c
index 56fef9a05504..42a1a1415fa6 100644
--- a/trunk/arch/arm/kernel/atags.c
+++ b/trunk/arch/arm/kernel/atags.c
@@ -6,9 +6,8 @@
 
 struct buffer {
 	size_t size;
-	char *data;
+	char data[];
 };
-static struct buffer tags_buffer;
 
 static int
 read_buffer(char* page, char** start, off_t off, int count,
@@ -28,58 +27,57 @@ read_buffer(char* page, char** start, off_t off, int count,
 	return count;
 }
 
-
-static int
-create_proc_entries(void)
-{
-	struct proc_dir_entry* tags_entry;
-
-	tags_entry = create_proc_read_entry("atags", 0400, NULL, read_buffer, &tags_buffer);
-	if (!tags_entry)
-		return -ENOMEM;
-
-	return 0;
-}
-
 #define BOOT_PARAMS_SIZE 1536
-static char __initdata atags_copy_buf[BOOT_PARAMS_SIZE];
-static char __initdata *atags_copy;
+static char __initdata atags_copy[BOOT_PARAMS_SIZE];
 
 void __init save_atags(const struct tag *tags)
 {
-	atags_copy = atags_copy_buf;
-	memcpy(atags_copy, tags, sizeof(atags_copy_buf));
+	memcpy(atags_copy, tags, sizeof(atags_copy));
 }
 
-
 static int __init init_atags_procfs(void)
 {
-	struct tag *tag;
-	int error;
+	/*
+	 * This cannot go into save_atags() because kmalloc and proc don't work
+	 * yet when it is called.
+	 */
+	struct proc_dir_entry *tags_entry;
+	struct tag *tag = (struct tag *)atags_copy;
+	struct buffer *b;
+	size_t size;
 
-	if (!atags_copy) {
-		printk(KERN_WARNING "Exporting ATAGs: No saved tags found\n");
-		return -EIO;
+	if (tag->hdr.tag != ATAG_CORE) {
+		printk(KERN_INFO "No ATAGs?");
+		return -EINVAL;
 	}
 
-	for (tag = (struct tag *) atags_copy; tag->hdr.size; tag = tag_next(tag))
+	for (; tag->hdr.size; tag = tag_next(tag))
 		;
 
-	tags_buffer.size = ((char *) tag - atags_copy) + sizeof(tag->hdr);
-	tags_buffer.data = kmalloc(tags_buffer.size, GFP_KERNEL);
-	if (tags_buffer.data == NULL)
-		return -ENOMEM;
-	memcpy(tags_buffer.data, atags_copy, tags_buffer.size);
-
-	error = create_proc_entries();
-	if (error) {
-		printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
-		kfree(tags_buffer.data);
-		tags_buffer.size = 0;
-		tags_buffer.data = NULL;
-	}
+	/* include the terminating ATAG_NONE */
+	size = (char *)tag - atags_copy + sizeof(struct tag_header);
 
-	return error;
-}
+	WARN_ON(tag->hdr.tag != ATAG_NONE);
+
+	b = kmalloc(sizeof(*b) + size, GFP_KERNEL);
+	if (!b)
+		goto nomem;
 
+	b->size = size;
+	memcpy(b->data, atags_copy, size);
+
+	tags_entry = create_proc_read_entry("atags", 0400,
+			NULL, read_buffer, b);
+
+	if (!tags_entry)
+		goto nomem;
+
+	return 0;
+
+nomem:
+	kfree(b);
+	printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
+
+	return -ENOMEM;
+}
 arch_initcall(init_atags_procfs);