efivarfs: Never return ENOENT from firmware

Files are created in efivarfs_create() before a corresponding variable
is created in the firmware. This leads to users being able to
read/write to the file without the variable existing in the
firmware. Reading a non-existent variable currently returns -ENOENT,
which is confusing because the file obviously *does* exist.

Convert EFI_NOT_FOUND into -EIO which is the closest thing to "error
while interacting with firmware", and should hopefully indicate to the
caller that the variable is in some uninitialised state.

Cc: Josh Boyer <[email protected]>
Acked-by: Jeremy Kerr <[email protected]>
Cc: Lee, Chun-Yi <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Reported-by: Lingzhu Xiang <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>

0 files changed, 0 insertions, 0 deletions