1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 89f47ded1e23..e54ba0bfa0d6 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -295,6 +295,8 @@ enum sdebug_err_type {
 					/* with errors set in scsi_cmnd */
 	ERR_ABORT_CMD_FAILED	= 3,	/* control return FAILED from */
 					/* scsi_debug_abort() */
+	ERR_LUN_RESET_FAILED	= 4,	/* control return FAILED from */
+					/* scsi_debug_device_reseLUN_RESET_FAILEDt() */
 };
 
 struct sdebug_err_inject {
@@ -973,6 +975,7 @@ static int sdebug_error_show(struct seq_file *m, void *p)
 		switch (err->type) {
 		case ERR_TMOUT_CMD:
 		case ERR_ABORT_CMD_FAILED:
+		case ERR_LUN_RESET_FAILED:
 			seq_printf(m, "%d\t%d\t0x%x\n", err->type, err->cnt,
 				err->cmd);
 		break;
@@ -1035,6 +1038,7 @@ static ssize_t sdebug_error_write(struct file *file, const char __user *ubuf,
 	switch (inject_type) {
 	case ERR_TMOUT_CMD:
 	case ERR_ABORT_CMD_FAILED:
+	case ERR_LUN_RESET_FAILED:
 		if (sscanf(buf, "%d %d %hhx", &inject->type, &inject->cnt,
 			   &inject->cmd) != 3)
 			goto out_error;
@@ -5586,10 +5590,40 @@ static void scsi_debug_stop_all_queued(struct scsi_device *sdp)
 				scsi_debug_stop_all_queued_iter, sdp);
 }
 
+static int sdebug_fail_lun_reset(struct scsi_cmnd *cmnd)
+{
+	struct scsi_device *sdp = cmnd->device;
+	struct sdebug_dev_info *devip = (struct sdebug_dev_info *)sdp->hostdata;
+	struct sdebug_err_inject *err;
+	unsigned char *cmd = cmnd->cmnd;
+	int ret = 0;
+
+	if (devip == NULL)
+		return 0;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(err, &devip->inject_err_list, list) {
+		if (err->type == ERR_LUN_RESET_FAILED &&
+		    (err->cmd == cmd[0] || err->cmd == 0xff)) {
+			ret = !!err->cnt;
+			if (err->cnt < 0)
+				err->cnt++;
+
+			rcu_read_unlock();
+			return ret;
+		}
+	}
+	rcu_read_unlock();
+
+	return 0;
+}
+
 static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt)
 {
 	struct scsi_device *sdp = SCpnt->device;
 	struct sdebug_dev_info *devip = sdp->hostdata;
+	u8 *cmd = SCpnt->cmnd;
+	u8 opcode = cmd[0];
 
 	++num_dev_resets;
 
@@ -5600,6 +5634,11 @@ static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt)
 	if (devip)
 		set_bit(SDEBUG_UA_POR, devip->uas_bm);
 
+	if (sdebug_fail_lun_reset(SCpnt)) {
+		scmd_printk(KERN_INFO, SCpnt, "fail lun reset 0x%x\n", opcode);
+		return FAILED;
+	}
+
 	return SUCCESS;
 }