[SCSI] scsi_debug: fix resp_xdwriteread() return value when running out of memory

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>
Reviewed-by: Douglas Gilbert <dgilbert@interlog.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 1a4288032110..a10251908875 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));