target/fileio: Fix zero-length READ and WRITE handling

[ Upstream commit 59ac9c078141b8fd0186c0b18660a1b2c24e724e ]

This patch fixes zero-length READ and WRITE handling in target/FILEIO,
which was broken a long time back by:

Since:

  commit d81cb44726f050d7cf1be4afd9cb45d153b52066
  Author: Paolo Bonzini <pbonzini@redhat.com>
  Date:   Mon Sep 17 16:36:11 2012 -0700

      target: go through normal processing for all zero-length commands

which moved zero-length READ and WRITE completion out of target-core,
to doing submission into backend driver code.

To address this, go ahead and invoke target_complete_cmd() for any
non negative return value in fd_do_rw().

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: David Disseldorp <ddiss@suse.de>
Cc: <stable@vger.kernel.org> # v3.7+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 3f27bfd816d87201c5f3cec3ad7857ead488191b..dee7dfdf203adca4bbbd22421486ee9f0365a81a 100644 (file)
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -707,8 +707,7 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
        }
 
-       if (ret)
-               target_complete_cmd(cmd, SAM_STAT_GOOD);
+       target_complete_cmd(cmd, SAM_STAT_GOOD);
        return 0;
 }