[PATCH v2 4/7] scsi_debug: fix resp_xdwriteread() return value when running out of memory

Akinobu Mita
2014-01-19T13:52:01Z

When resp_xdwriteread() can't allocate temporary buffer, it returns -1.
But the return value is used as scsi status code and -1 is not
interpreted as correct code.

target_core_mod has similar xdwriteread emulation code. So this mimics
what target_core_mod does for xdwriteread when running out of memory.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: linux-scsi@vger.kernel.org
---
No change from previous version

drivers/scsi/scsi_debug.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 1a42880..a102519 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -64,6 +64,7 @@ static const char * scsi_debug_version_date = "20100324";
/* Additional Sense Code (ASC) */
#define NO_ADDITIONAL_SENSE 0x0
#define LOGICAL_UNIT_NOT_READY 0x4
+#define LOGICAL_UNIT_COMMUNICATION_FAILURE 0x8
#define UNRECOVERED_READ_ERR 0x11
#define PARAMETER_LIST_LENGTH_ERR 0x1a
#define INVALID_OPCODE 0x20
@@ -2318,8 +2319,11 @@ static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,

/* better not to use temporary buffer. */
buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
- if (!buf)
- return ret;
+ if (!buf) {
+ mk_sense_buffer(devip, NOT_READY,
+ LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+ return check_condition_result;
+ }

scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));

--
1.8.3.2