From 3fab70c165795431f00ddf9be8b84ddd07bd1f8f Mon Sep 17 00:00:00 2001 From: Lingzhu Xiang Date: Fri, 10 May 2013 18:29:21 +0800 Subject: [PATCH] efivarfs: Never return ENOENT from firmware again Previously in 1fa7e69 efi_status_to_err() translated firmware status EFI_NOT_FOUND to -EIO instead of -ENOENT for efivarfs operations to avoid confusion. After refactoring in e14ab23, it is also used in other places where the translation may be unnecessary. So move the translation to efivarfs specific code. Also return EOF for reading zero-length files, which is what users would expect. Cc: Josh Boyer Cc: Jeremy Kerr Cc: Lee, Chun-Yi Cc: Andy Whitcroft Signed-off-by: Lingzhu Xiang Signed-off-by: Matt Fleming --- fs/efivarfs/file.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c index bfb531564319..8dd524f32284 100644 --- a/fs/efivarfs/file.c +++ b/fs/efivarfs/file.c @@ -44,8 +44,11 @@ static ssize_t efivarfs_file_write(struct file *file, bytes = efivar_entry_set_get_size(var, attributes, &datasize, data, &set); - if (!set && bytes) + if (!set && bytes) { + if (bytes == -ENOENT) + bytes = -EIO; goto out; + } if (bytes == -ENOENT) { drop_nlink(inode); @@ -76,7 +79,14 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, int err; err = efivar_entry_size(var, &datasize); - if (err) + + /* + * efivarfs represents uncommitted variables with + * zero-length files. Reading them should return EOF. + */ + if (err == -ENOENT) + return 0; + else if (err) return err; data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);