efivarfs: Never return ENOENT from firmware again

[karo-tx-linux.git] / fs / efivarfs / file.c

diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c
index bfb531564319608be19b63885142eb6b5c7648d9..8dd524f322847b346e119c6d5c5b3693de6fb8bc 100644 (file)
--- 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);