tree dfad1b29759c54f4ce5141f6d15b8f3d18d00b6e
parent 1c3d5794fc4a2afd2258b3aa6406377934a36663
author Roland Dreier <roland@purestorage.com> 1321998692 -0800
committer Nicholas Bellinger <nab@linux-iscsi.org> 1323151255 +0000

target: Don't return an error status for 0-length READ and WRITE

IO commands with a TRANSFER LENGTH of 0 are not an error; for example,
for READ (10) and WRITE (10), SBC-3 says:

    A TRANSFER LENGTH field set to zero specifies that no logical blocks
    shall be read. This condition shall not be considered an error.

In case we have nothing to do, just complete the command with good status.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>