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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/scsi/scsi_error.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  scsi_error.c Copyright (C) 1997 Eric Youngdale
34  *
....@@ -115,6 +116,14 @@
115116 	return 1;
116117 }
117118 
119
+static bool scsi_cmd_retry_allowed(struct scsi_cmnd *cmd)
120
+{
121
+	if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)
122
+		return true;
123
+
124
+	return ++cmd->retries <= cmd->allowed;
125
+}
126
+
118127 /**
119128  * scmd_eh_abort_handler - Handle command aborts
120129  * @work:	command to be aborted.
....@@ -150,7 +159,7 @@
150159 						    "eh timeout, not retrying "
151160 						    "aborted command\n"));
152161 			} else if (!scsi_noretry_cmd(scmd) &&
153
-			    (++scmd->retries <= scmd->allowed)) {
162
+				   scsi_cmd_retry_allowed(scmd)) {
154163 				SCSI_LOG_ERROR_RECOVERY(3,
155164 					scmd_printk(KERN_WARNING, scmd,
156165 						    "retry aborted command\n"));
....@@ -297,19 +306,11 @@
297306 
298307 	if (rtn == BLK_EH_DONE) {
299308 		/*
300
-		 * For blk-mq, we must set the request state to complete now
301
-		 * before sending the request to the scsi error handler. This
302
-		 * will prevent a use-after-free in the event the LLD manages
303
-		 * to complete the request before the error handler finishes
304
-		 * processing this timed out request.
305
-		 *
306
-		 * If the request was already completed, then the LLD beat the
307
-		 * time out handler from transferring the request to the scsi
308
-		 * error handler. In that case we can return immediately as no
309
-		 * further action is required.
309
+		 * If scsi_done() has already set SCMD_STATE_COMPLETE, do not
310
+		 * modify *scmd.
310311 		 */
311
-		if (req->q->mq_ops && !blk_mq_mark_complete(req))
312
-			return rtn;
312
+		if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state))
313
+			return BLK_EH_DONE;
313314 		if (scsi_abort_command(scmd) != SUCCESS) {
314315 			set_host_byte(scmd, DID_TIME_OUT);
315316 			scsi_eh_scmd_add(scmd);
....@@ -337,9 +338,6 @@
337338 	wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));
338339 
339340 	online = scsi_device_online(sdev);
340
-
341
-	SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev,
342
-		"%s: rtn: %d\n", __func__, online));
343341 
344342 	return online;
345343 }
....@@ -601,7 +599,7 @@
601599 			set_host_byte(scmd, DID_ALLOC_FAILURE);
602600 			return SUCCESS;
603601 		}
604
-		/* FALLTHROUGH */
602
+		fallthrough;
605603 	case COPY_ABORTED:
606604 	case VOLUME_OVERFLOW:
607605 	case MISCOMPARE:
....@@ -623,7 +621,7 @@
623621 			return ADD_TO_MLQUEUE;
624622 		else
625623 			set_host_byte(scmd, DID_TARGET_FAILURE);
626
-		/* FALLTHROUGH */
624
+		fallthrough;
627625 
628626 	case ILLEGAL_REQUEST:
629627 		if (sshdr.asc == 0x20 || /* Invalid command operation code */
....@@ -736,7 +734,7 @@
736734 	switch (status_byte(scmd->result)) {
737735 	case GOOD:
738736 		scsi_handle_queue_ramp_up(scmd->device);
739
-		/* FALLTHROUGH */
737
+		fallthrough;
740738 	case COMMAND_TERMINATED:
741739 		return SUCCESS;
742740 	case CHECK_CONDITION:
....@@ -757,7 +755,7 @@
757755 		return FAILED;
758756 	case QUEUE_FULL:
759757 		scsi_handle_queue_full(scmd->device);
760
-		/* fall through */
758
+		fallthrough;
761759 	case BUSY:
762760 		return NEEDS_RETRY;
763761 	default:
....@@ -968,7 +966,6 @@
968966 	ses->cmnd = scmd->cmnd;
969967 	ses->data_direction = scmd->sc_data_direction;
970968 	ses->sdb = scmd->sdb;
971
-	ses->next_rq = scmd->request->next_rq;
972969 	ses->result = scmd->result;
973970 	ses->resid_len = scmd->req.resid_len;
974971 	ses->underflow = scmd->underflow;
....@@ -980,7 +977,6 @@
980977 	scmd->cmnd = ses->eh_cmnd;
981978 	memset(scmd->cmnd, 0, BLK_MAX_CDB);
982979 	memset(&scmd->sdb, 0, sizeof(scmd->sdb));
983
-	scmd->request->next_rq = NULL;
984980 	scmd->result = 0;
985981 	scmd->req.resid_len = 0;
986982 
....@@ -1034,7 +1030,6 @@
10341030 	scmd->cmnd = ses->cmnd;
10351031 	scmd->sc_data_direction = ses->data_direction;
10361032 	scmd->sdb = ses->sdb;
1037
-	scmd->request->next_rq = ses->next_rq;
10381033 	scmd->result = ses->result;
10391034 	scmd->req.resid_len = ses->resid_len;
10401035 	scmd->underflow = ses->underflow;
....@@ -1063,7 +1058,7 @@
10631058 	struct scsi_device *sdev = scmd->device;
10641059 	struct Scsi_Host *shost = sdev->host;
10651060 	DECLARE_COMPLETION_ONSTACK(done);
1066
-	unsigned long timeleft = timeout;
1061
+	unsigned long timeleft = timeout, delay;
10671062 	struct scsi_eh_save ses;
10681063 	const unsigned long stall_for = msecs_to_jiffies(100);
10691064 	int rtn;
....@@ -1074,7 +1069,29 @@
10741069 
10751070 	scsi_log_send(scmd);
10761071 	scmd->scsi_done = scsi_eh_done;
1077
-	rtn = shost->hostt->queuecommand(shost, scmd);
1072
+
1073
+	/*
1074
+	 * Lock sdev->state_mutex to avoid that scsi_device_quiesce() can
1075
+	 * change the SCSI device state after we have examined it and before
1076
+	 * .queuecommand() is called.
1077
+	 */
1078
+	mutex_lock(&sdev->state_mutex);
1079
+	while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) {
1080
+		mutex_unlock(&sdev->state_mutex);
1081
+		SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_DEBUG, sdev,
1082
+			"%s: state %d <> %d\n", __func__, sdev->sdev_state,
1083
+			SDEV_BLOCK));
1084
+		delay = min(timeleft, stall_for);
1085
+		timeleft -= delay;
1086
+		msleep(jiffies_to_msecs(delay));
1087
+		mutex_lock(&sdev->state_mutex);
1088
+	}
1089
+	if (sdev->sdev_state != SDEV_BLOCK)
1090
+		rtn = shost->hostt->queuecommand(shost, scmd);
1091
+	else
1092
+		rtn = SCSI_MLQUEUE_DEVICE_BUSY;
1093
+	mutex_unlock(&sdev->state_mutex);
1094
+
10781095 	if (rtn) {
10791096 		if (timeleft > stall_for) {
10801097 			scsi_eh_restore_cmnd(scmd, &ses);
....@@ -1247,11 +1264,18 @@
12471264 		 * upper level.
12481265 		 */
12491266 		if (rtn == SUCCESS)
1250
-			/* we don't want this command reissued, just
1251
-			 * finished with the sense data, so set
1252
-			 * retries to the max allowed to ensure it
1253
-			 * won't get reissued */
1254
-			scmd->retries = scmd->allowed;
1267
+			/*
1268
+			 * We don't want this command reissued, just finished
1269
+			 * with the sense data, so set retries to the max
1270
+			 * allowed to ensure it won't get reissued. If the user
1271
+			 * has requested infinite retries, we also want to
1272
+			 * finish this command, so force completion by setting
1273
+			 * retries and allowed to the same value.
1274
+			 */
1275
+			if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)
1276
+				scmd->retries = scmd->allowed = 1;
1277
+			else
1278
+				scmd->retries = scmd->allowed;
12551279 		else if (rtn != NEEDS_RETRY)
12561280 			continue;
12571281 
....@@ -1285,7 +1309,7 @@
12851309 	case NEEDS_RETRY:
12861310 		if (retry_cnt--)
12871311 			goto retry_tur;
1288
-		/*FALLTHRU*/
1312
+		fallthrough;
12891313 	case SUCCESS:
12901314 		return 0;
12911315 	default:
....@@ -1395,6 +1419,7 @@
13951419 				sdev_printk(KERN_INFO, sdev,
13961420 					    "%s: skip START_UNIT, past eh deadline\n",
13971421 					    current->comm));
1422
+			scsi_device_put(sdev);
13981423 			break;
13991424 		}
14001425 		stu_scmd = NULL;
....@@ -1461,6 +1486,7 @@
14611486 				sdev_printk(KERN_INFO, sdev,
14621487 					    "%s: skip BDR, past eh deadline\n",
14631488 					     current->comm));
1489
+			scsi_device_put(sdev);
14641490 			break;
14651491 		}
14661492 		bdr_scmd = NULL;
....@@ -1720,7 +1746,7 @@
17201746 		if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
17211747 		    status_byte(scmd->result) == RESERVATION_CONFLICT)
17221748 			return 0;
1723
-		/* fall through */
1749
+		fallthrough;
17241750 	case DID_SOFT_ERROR:
17251751 		return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER);
17261752 	}
....@@ -1736,8 +1762,8 @@
17361762 	if (scmd->request->cmd_flags & REQ_FAILFAST_DEV ||
17371763 	    blk_rq_is_passthrough(scmd->request))
17381764 		return 1;
1739
-	else
1740
-		return 0;
1765
+
1766
+	return 0;
17411767 }
17421768 
17431769 /**
....@@ -1791,7 +1817,7 @@
17911817 			set_host_byte(scmd, DID_TIME_OUT);
17921818 			return SUCCESS;
17931819 		}
1794
-		/* FALLTHROUGH */
1820
+		fallthrough;
17951821 	case DID_NO_CONNECT:
17961822 	case DID_BAD_TARGET:
17971823 		/*
....@@ -1835,7 +1861,7 @@
18351861 			 * lower down
18361862 			 */
18371863 			break;
1838
-		/* fallthrough */
1864
+		fallthrough;
18391865 	case DID_BUS_BUSY:
18401866 	case DID_PARITY:
18411867 		goto maybe_retry;
....@@ -1873,7 +1899,7 @@
18731899 		 * the case of trying to send too many commands to a
18741900 		 * tagged queueing device.
18751901 		 */
1876
-		/* FALLTHROUGH */
1902
+		fallthrough;
18771903 	case BUSY:
18781904 		/*
18791905 		 * device can't talk to us at the moment.  Should only
....@@ -1886,7 +1912,7 @@
18861912 		if (scmd->cmnd[0] == REPORT_LUNS)
18871913 			scmd->device->sdev_target->expecting_lun_change = 0;
18881914 		scsi_handle_queue_ramp_up(scmd->device);
1889
-		/* FALLTHROUGH */
1915
+		fallthrough;
18901916 	case COMMAND_TERMINATED:
18911917 		return SUCCESS;
18921918 	case TASK_ABORTED:
....@@ -1925,8 +1951,7 @@
19251951 	 * the request was not marked fast fail.  Note that above,
19261952 	 * even if the request is marked fast fail, we still requeue
19271953 	 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1928
-	if ((++scmd->retries) <= scmd->allowed
1929
-	    && !scsi_noretry_cmd(scmd)) {
1954
+	if (scsi_cmd_retry_allowed(scmd) && !scsi_noretry_cmd(scmd)) {
19301955 		return NEEDS_RETRY;
19311956 	} else {
19321957 		/*
....@@ -1938,7 +1963,7 @@
19381963 
19391964 static void eh_lock_door_done(struct request *req, blk_status_t status)
19401965 {
1941
-	__blk_put_request(req->q, req);
1966
+	blk_put_request(req);
19421967 }
19431968 
19441969 /**
....@@ -2072,8 +2097,7 @@
20722097 	list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
20732098 		list_del_init(&scmd->eh_entry);
20742099 		if (scsi_device_online(scmd->device) &&
2075
-		    !scsi_noretry_cmd(scmd) &&
2076
-		    (++scmd->retries <= scmd->allowed)) {
2100
+		    !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd)) {
20772101 			SCSI_LOG_ERROR_RECOVERY(3,
20782102 				scmd_printk(KERN_INFO, scmd,
20792103 					     "%s: flush retry cmd\n",
....@@ -2357,22 +2381,22 @@
23572381 		rtn = scsi_try_bus_device_reset(scmd);
23582382 		if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
23592383 			break;
2360
-		/* FALLTHROUGH */
2384
+		fallthrough;
23612385 	case SG_SCSI_RESET_TARGET:
23622386 		rtn = scsi_try_target_reset(scmd);
23632387 		if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
23642388 			break;
2365
-		/* FALLTHROUGH */
2389
+		fallthrough;
23662390 	case SG_SCSI_RESET_BUS:
23672391 		rtn = scsi_try_bus_reset(scmd);
23682392 		if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
23692393 			break;
2370
-		/* FALLTHROUGH */
2394
+		fallthrough;
23712395 	case SG_SCSI_RESET_HOST:
23722396 		rtn = scsi_try_host_reset(scmd);
23732397 		if (rtn == SUCCESS)
23742398 			break;
2375
-		/* FALLTHROUGH */
2399
+		fallthrough;
23762400 	default:
23772401 		rtn = FAILED;
23782402 		break;
....@@ -2395,14 +2419,12 @@
23952419 	wake_up(&shost->host_wait);
23962420 	scsi_run_host_queues(shost);
23972421 
2398
-	scsi_put_command(scmd);
23992422 	kfree(rq);
24002423 
24012424 out_put_autopm_host:
24022425 	scsi_autopm_put_host(shost);
24032426 	return error;
24042427 }
2405
-EXPORT_SYMBOL(scsi_ioctl_reset);
24062428 
24072429 bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
24082430 				  struct scsi_sense_hdr *sshdr)