[PATCH 4.9 03/80] target/fileio: Fix zero-length READ and WRITE handling

From: Greg Kroah-Hartman
Date: Thu May 18 2017 - 06:58:24 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>

commit 59ac9c078141b8fd0186c0b18660a1b2c24e724e upstream.

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@xxxxxxxxxx>
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@xxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Andy Grover <agrover@xxxxxxxxxx>
Cc: David Disseldorp <ddiss@xxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/target/target_core_file.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -594,8 +594,7 @@ fd_execute_rw(struct se_cmd *cmd, struct
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

- if (ret)
- target_complete_cmd(cmd, SAM_STAT_GOOD);
+ target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}