From: H. Peter Anvin <hpa@linux.intel.com>
Date: Sat, 20 Apr 2013 16:16:44 +0000 (-0700)
Subject: Merge remote-tracking branch 'efi/chainsaw' into x86/efi
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f53f292eeaa234615c31a1306babe703fc4263f2;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Merge remote-tracking branch 'efi/chainsaw' into x86/efi

Resolved Conflicts:
	drivers/firmware/efivars.c
	fs/efivarsfs/file.c

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

f53f292eeaa234615c31a1306babe703fc4263f2
diff --cc fs/efivarfs/file.c
index 000000000000,aeb0368dace2..ede07fc7309f
mode 000000,100644..100644
--- a/fs/efivarfs/file.c
+++ b/fs/efivarfs/file.c
@@@ -1,0 -1,111 +1,105 @@@
+ /*
+  * Copyright (C) 2012 Red Hat, Inc.
+  * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
+  *
+  * This program is free software; you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License version 2 as
+  * published by the Free Software Foundation.
+  */
+ 
+ #include <linux/efi.h>
+ #include <linux/fs.h>
+ 
+ #include "internal.h"
+ 
 -static int efivarfs_file_open(struct inode *inode, struct file *file)
 -{
 -	file->private_data = inode->i_private;
 -	return 0;
 -}
 -
+ static ssize_t efivarfs_file_write(struct file *file,
+ 		const char __user *userbuf, size_t count, loff_t *ppos)
+ {
+ 	struct efivar_entry *var = file->private_data;
+ 	void *data;
+ 	u32 attributes;
+ 	struct inode *inode = file->f_mapping->host;
+ 	unsigned long datasize = count - sizeof(attributes);
+ 	ssize_t bytes = 0;
+ 	bool set = false;
+ 
+ 	if (count < sizeof(attributes))
+ 		return -EINVAL;
+ 
+ 	if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
+ 		return -EFAULT;
+ 
+ 	if (attributes & ~(EFI_VARIABLE_MASK))
+ 		return -EINVAL;
+ 
+ 	data = kmalloc(datasize, GFP_KERNEL);
+ 	if (!data)
+ 		return -ENOMEM;
+ 
+ 	if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
+ 		bytes = -EFAULT;
+ 		goto out;
+ 	}
+ 
+ 	bytes = efivar_entry_set_get_size(var, attributes, &datasize,
+ 					  data, &set);
+ 	if (!set && bytes)
+ 		goto out;
+ 
+ 	if (bytes == -ENOENT) {
+ 		drop_nlink(inode);
+ 		d_delete(file->f_dentry);
+ 		dput(file->f_dentry);
+ 	} else {
+ 		mutex_lock(&inode->i_mutex);
+ 		i_size_write(inode, datasize + sizeof(attributes));
+ 		mutex_unlock(&inode->i_mutex);
+ 	}
+ 
+ 	bytes = count;
+ 
+ out:
+ 	kfree(data);
+ 
+ 	return bytes;
+ }
+ 
+ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
+ 		size_t count, loff_t *ppos)
+ {
+ 	struct efivar_entry *var = file->private_data;
+ 	unsigned long datasize = 0;
+ 	u32 attributes;
+ 	void *data;
+ 	ssize_t size = 0;
+ 	int err;
+ 
+ 	err = efivar_entry_size(var, &datasize);
+ 	if (err)
+ 		return err;
+ 
+ 	data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
+ 
+ 	if (!data)
+ 		return -ENOMEM;
+ 
+ 	size = efivar_entry_get(var, &attributes, &datasize,
+ 				data + sizeof(attributes));
+ 	if (size)
+ 		goto out_free;
+ 
+ 	memcpy(data, &attributes, sizeof(attributes));
+ 	size = simple_read_from_buffer(userbuf, count, ppos,
+ 				       data, datasize + sizeof(attributes));
+ out_free:
+ 	kfree(data);
+ 
+ 	return size;
+ }
+ 
+ const struct file_operations efivarfs_file_operations = {
 -	.open	= efivarfs_file_open,
++	.open	= simple_open,
+ 	.read	= efivarfs_file_read,
+ 	.write	= efivarfs_file_write,
+ 	.llseek	= no_llseek,
+ };