Enable lock context analysis in the SCSI core and UFS driver

index 1a5a851d43b2..5f99aad26d57 100644
@@ -1317,6 +1317,7 @@ static int ufshcd_wait_for_pending_cmds(struct ufs_hba *hba,
 			break;
 		}
 
+		__set_current_state(TASK_UNINTERRUPTIBLE);
 		io_schedule_timeout(msecs_to_jiffies(20));
 		if (ktime_to_us(ktime_sub(ktime_get(), start)) >
 		    wait_timeout_us) {

index e3dd81d6fe82..814816810388 100644
@@ -65,8 +65,10 @@ static int ee_usr_mask_get(void *data, u64 *val)
 	return 0;
 }
 
+token_context_lock(ufs_debugfs);
+
 static int ufs_debugfs_get_user_access(struct ufs_hba *hba)
-__acquires(&hba->host_sem)
+	__cond_acquires(0, ufs_debugfs)
 {
 	down(&hba->host_sem);
 	if (!ufshcd_is_user_access_allowed(hba)) {

@@ -74,14 +76,16 @@ __acquires(&hba->host_sem)
 		return -EBUSY;
 	}
 	ufshcd_rpm_get_sync(hba);
+	__acquire(ufs_debugfs);
 	return 0;
 }
 
 static void ufs_debugfs_put_user_access(struct ufs_hba *hba)
-__releases(&hba->host_sem)
+	__releases(ufs_debugfs)
 {
 	ufshcd_rpm_put_sync(hba);
 	up(&hba->host_sem);
+	__release(ufs_debugfs);
 }
 
 static int ee_usr_mask_set(void *data, u64 val)

index 5f99aad26d57..b34e2da4c320 100644
@@ -1354,6 +1354,8 @@ static int ufshcd_wait_for_pending_cmds(struct ufs_hba *hba,
  * On failure, all acquired locks are released and the tagset is unquiesced.
  */
 int ufshcd_pause_command_processing(struct ufs_hba *hba, u64 timeout_us)
+	__cond_acquires(0, &hba->host->scan_mutex)
+	__cond_acquires(0, &hba->clk_scaling_lock)
 {
 	int ret = 0;
 

@@ -1378,6 +1380,8 @@ int ufshcd_pause_command_processing(struct ufs_hba *hba, u64 timeout_us)
  * This function resumes command submissions.
  */
 void ufshcd_resume_command_processing(struct ufs_hba *hba)
+	__releases(&hba->clk_scaling_lock)
+	__releases(&hba->host->scan_mutex)
 {
 	up_write(&hba->clk_scaling_lock);
 	blk_mq_unquiesce_tagset(&hba->host->tag_set);

@@ -1447,6 +1451,9 @@ static int ufshcd_scale_gear(struct ufs_hba *hba, u32 target_gear, bool scale_up
  * Return: 0 upon success; -EBUSY upon timeout.
  */
 static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba, u64 timeout_us)
+	__cond_acquires(0, &hba->host->scan_mutex)
+	__cond_acquires(0, &hba->wb_mutex)
+	__cond_acquires(0, &hba->clk_scaling_lock)
 {
 	int ret = 0;
 	/*

@@ -1476,6 +1483,9 @@ static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba, u64 timeout_us)
 }
 
 static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba, int err)
+	__releases(&hba->clk_scaling_lock)
+	__releases(&hba->wb_mutex)
+	__releases(&hba->host->scan_mutex)
 {
 	up_write(&hba->clk_scaling_lock);
 	mutex_unlock(&hba->wb_mutex);

@@ -3283,6 +3293,8 @@ ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 }
 
 static void ufshcd_dev_man_lock(struct ufs_hba *hba)
+	__acquires(&hba->dev_cmd.lock)
+	__acquires_shared(&hba->clk_scaling_lock)
 {
 	ufshcd_hold(hba);
 	mutex_lock(&hba->dev_cmd.lock);

@@ -3290,6 +3302,8 @@ static void ufshcd_dev_man_lock(struct ufs_hba *hba)
 }
 
 static void ufshcd_dev_man_unlock(struct ufs_hba *hba)
+	__releases_shared(&hba->clk_scaling_lock)
+	__releases(&hba->dev_cmd.lock)
 {
 	up_read(&hba->clk_scaling_lock);
 	mutex_unlock(&hba->dev_cmd.lock);

index e27da038603a..d7e0e9393194 100644
@@ -1169,6 +1169,7 @@ static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
 
 /**
  * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
+ * @shost:      SCSI host pointer
  * @starget:	pointer to target device structure
  * @lun:	LUN of target device
  * @bflagsp:	store bflags here if not NULL

@@ -1188,7 +1189,8 @@ static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
  *         attached at the LUN
  *   - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
  **/
-static int scsi_probe_and_add_lun(struct scsi_target *starget,
+static int scsi_probe_and_add_lun(struct Scsi_Host *shost,
+				  struct scsi_target *starget,
 				  u64 lun, blist_flags_t *bflagsp,
 				  struct scsi_device **sdevp,
 				  enum scsi_scan_mode rescan,

@@ -1198,7 +1200,6 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
 	unsigned char *result;
 	blist_flags_t bflags;
 	int res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
-	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 
 	/*
 	 * The rescan flag is used as an optimization, the first scan of a

@@ -1334,6 +1335,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
 
 /**
  * scsi_sequential_lun_scan - sequentially scan a SCSI target
+ * @shost:      SCSI host pointer
  * @starget:	pointer to target structure to scan
  * @bflags:	black/white list flag for LUN 0
  * @scsi_level: Which version of the standard does this device adhere to

@@ -1346,13 +1348,13 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
  *
  *     Modifies sdevscan->lun.
  **/
-static void scsi_sequential_lun_scan(struct scsi_target *starget,
+static void scsi_sequential_lun_scan(struct Scsi_Host *shost,
+				     struct scsi_target *starget,
 				     blist_flags_t bflags, int scsi_level,
 				     enum scsi_scan_mode rescan)
 {
 	uint max_dev_lun;
 	u64 sparse_lun, lun;
-	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 
 	SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
 		"scsi scan: Sequential scan\n"));

@@ -1412,14 +1414,15 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
 	 * sparse_lun.
 	 */
 	for (lun = 1; lun < max_dev_lun; ++lun)
-		if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
-					    NULL) != SCSI_SCAN_LUN_PRESENT) &&
+		if (scsi_probe_and_add_lun(shost, starget, lun, NULL, NULL,
+				rescan, NULL) != SCSI_SCAN_LUN_PRESENT &&
 		    !sparse_lun)
 			return;
 }
 
 /**
  * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
+ * @shost: SCSI host pointer
  * @starget: which target
  * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
  * @rescan: nonzero if we can skip code only needed on first scan

@@ -1438,8 +1441,9 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
  *     0: scan completed (or no memory, so further scanning is futile)
  *     1: could not scan with REPORT LUN
  **/
-static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags,
-				enum scsi_scan_mode rescan)
+static int scsi_report_lun_scan(struct Scsi_Host *shost,
+			struct scsi_target *starget, blist_flags_t bflags,
+			enum scsi_scan_mode rescan)
 {
 	unsigned char scsi_cmd[MAX_COMMAND_SIZE];
 	unsigned int length;

@@ -1448,7 +1452,6 @@ static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflag
 	int result;
 	struct scsi_lun *lunp, *lun_data;
 	struct scsi_device *sdev;
-	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 	struct scsi_failure failure_defs[] = {
 		{
 			.sense = UNIT_ATTENTION,

@@ -1594,7 +1597,7 @@ static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflag
 		} else {
 			int res;
 
-			res = scsi_probe_and_add_lun(starget,
+			res = scsi_probe_and_add_lun(shost, starget,
 				lun, NULL, NULL, rescan, NULL);
 			if (res == SCSI_SCAN_NO_RESPONSE) {
 				/*

@@ -1641,7 +1644,7 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
 		scsi_complete_async_scans();
 
 	if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
-		scsi_probe_and_add_lun(starget, lun, NULL, &sdev,
+		scsi_probe_and_add_lun(shost, starget, lun, NULL, &sdev,
 				       SCSI_SCAN_RESCAN, hostdata);
 		scsi_autopm_put_host(shost);
 	}

@@ -1763,10 +1766,10 @@ int scsi_rescan_device(struct scsi_device *sdev)
 }
 EXPORT_SYMBOL(scsi_rescan_device);
 
-static void __scsi_scan_target(struct device *parent, unsigned int channel,
-		unsigned int id, u64 lun, enum scsi_scan_mode rescan)
+static void __scsi_scan_target(struct Scsi_Host *shost, struct device *parent,
+			       unsigned int channel, unsigned int id, u64 lun,
+			       enum scsi_scan_mode rescan)
 {
-	struct Scsi_Host *shost = dev_to_shost(parent);
 	blist_flags_t bflags = 0;
 	int res;
 	struct scsi_target *starget;

@@ -1786,7 +1789,8 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel,
 		/*
 		 * Scan for a specific host/chan/id/lun.
 		 */
-		scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
+		scsi_probe_and_add_lun(shost, starget, lun, NULL, NULL, rescan,
+				       NULL);
 		goto out_reap;
 	}
 

@@ -1794,14 +1798,15 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel,
 	 * Scan LUN 0, if there is some response, scan further. Ideally, we
 	 * would not configure LUN 0 until all LUNs are scanned.
 	 */
-	res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
+	res = scsi_probe_and_add_lun(shost, starget, 0, &bflags, NULL, rescan,
+				     NULL);
 	if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
-		if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
+		if (scsi_report_lun_scan(shost, starget, bflags, rescan) != 0)
 			/*
 			 * The REPORT LUN did not scan the target,
 			 * do a sequential scan.
 			 */
-			scsi_sequential_lun_scan(starget, bflags,
+			scsi_sequential_lun_scan(shost, starget, bflags,
 						 starget->scsi_level, rescan);
 	}
 

@@ -1851,7 +1856,7 @@ void scsi_scan_target(struct device *parent, unsigned int channel,
 		scsi_complete_async_scans();
 
 	if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
-		__scsi_scan_target(parent, channel, id, lun, rescan);
+		__scsi_scan_target(shost, parent, channel, id, lun, rescan);
 		scsi_autopm_put_host(shost);
 	}
 	mutex_unlock(&shost->scan_mutex);

@@ -1882,11 +1887,11 @@ static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
 				order_id = shost->max_id - id - 1;
 			else
 				order_id = id;
-			__scsi_scan_target(&shost->shost_gendev, channel,
+			__scsi_scan_target(shost, &shost->shost_gendev, channel,
 					order_id, lun, rescan);
 		}
 	else
-		__scsi_scan_target(&shost->shost_gendev, channel,
+		__scsi_scan_target(shost, &shost->shost_gendev, channel,
 				id, lun, rescan);
 }
 

index d7e0e9393194..3b82e80e807a 100644
@@ -1195,6 +1195,7 @@ static int scsi_probe_and_add_lun(struct Scsi_Host *shost,
 				  struct scsi_device **sdevp,
 				  enum scsi_scan_mode rescan,
 				  void *hostdata)
+	__must_hold(&shost->scan_mutex)
 {
 	struct scsi_device *sdev;
 	unsigned char *result;

@@ -1352,6 +1353,7 @@ static void scsi_sequential_lun_scan(struct Scsi_Host *shost,
 				     struct scsi_target *starget,
 				     blist_flags_t bflags, int scsi_level,
 				     enum scsi_scan_mode rescan)
+	__must_hold(&shost->scan_mutex)
 {
 	uint max_dev_lun;
 	u64 sparse_lun, lun;

@@ -1444,6 +1446,7 @@ static void scsi_sequential_lun_scan(struct Scsi_Host *shost,
 static int scsi_report_lun_scan(struct Scsi_Host *shost,
 			struct scsi_target *starget, blist_flags_t bflags,
 			enum scsi_scan_mode rescan)
+	__must_hold(&shost->scan_mutex)
 {
 	unsigned char scsi_cmd[MAX_COMMAND_SIZE];
 	unsigned int length;

@@ -1769,6 +1772,7 @@ EXPORT_SYMBOL(scsi_rescan_device);
 static void __scsi_scan_target(struct Scsi_Host *shost, struct device *parent,
 			       unsigned int channel, unsigned int id, u64 lun,
 			       enum scsi_scan_mode rescan)
+	__must_hold(&shost->scan_mutex)
 {
 	blist_flags_t bflags = 0;
 	int res;

@@ -1866,6 +1870,7 @@ EXPORT_SYMBOL(scsi_scan_target);
 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
 			      unsigned int id, u64 lun,
 			      enum scsi_scan_mode rescan)
+	__must_hold(&shost->scan_mutex)
 {
 	uint order_id;
 

index d512080268af..d036accb4903 100644
@@ -74,7 +74,7 @@ static struct class shost_class = {
  **/
 int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
 {
-	enum scsi_host_state oldstate = shost->shost_state;
+	enum scsi_host_state oldstate = READ_ONCE(shost->shost_state);
 
 	if (state == oldstate)
 		return 0;

@@ -145,7 +145,7 @@ int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
 		}
 		break;
 	}
-	shost->shost_state = state;
+	WRITE_ONCE(shost->shost_state, state);
 	return 0;
 
  illegal:

@@ -276,7 +276,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
 	if (error)
 		goto out_disable_runtime_pm;
 
-	scsi_host_set_state(shost, SHOST_RUNNING);
+	scoped_guard(spinlock_irq, shost->host_lock)
+		scsi_host_set_state(shost, SHOST_RUNNING);
 	get_device(shost->shost_gendev.parent);
 
 	device_enable_async_suspend(&shost->shost_dev);

@@ -350,6 +351,7 @@ EXPORT_SYMBOL(scsi_add_host_with_dma);
 static void scsi_host_dev_release(struct device *dev)
 {
 	struct Scsi_Host *shost = dev_to_shost(dev);
+	enum scsi_host_state host_state = scsi_get_host_state(shost);
 	struct device *parent = dev->parent;
 
 	/* Wait for functions invoked through call_rcu(&scmd->rcu, ...) */

@@ -362,7 +364,7 @@ static void scsi_host_dev_release(struct device *dev)
 	if (shost->work_q)
 		destroy_workqueue(shost->work_q);
 
-	if (shost->shost_state == SHOST_CREATED) {
+	if (host_state == SHOST_CREATED) {
 		/*
 		 * Free the shost_dev device name and remove the proc host dir
 		 * here if scsi_host_{alloc,put}() have been called but neither

@@ -378,7 +380,7 @@ static void scsi_host_dev_release(struct device *dev)
 
 	ida_free(&host_index_ida, shost->host_no);
 
-	if (shost->shost_state != SHOST_CREATED)
+	if (host_state != SHOST_CREATED)
 		put_device(parent);
 	kfree(shost);
 }

@@ -411,8 +413,8 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
 		return NULL;
 
 	shost->host_lock = &shost->default_lock;
-	spin_lock_init(shost->host_lock);
-	shost->shost_state = SHOST_CREATED;
+	scoped_guard(spinlock_init, shost->host_lock)
+		shost->shost_state = SHOST_CREATED;
 	INIT_LIST_HEAD(&shost->__devices);
 	INIT_LIST_HEAD(&shost->__targets);
 	INIT_LIST_HEAD(&shost->eh_abort_list);

@@ -598,7 +600,7 @@ EXPORT_SYMBOL(scsi_host_lookup);
  **/
 struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost)
 {
-	if ((shost->shost_state == SHOST_DEL) ||
+	if (scsi_get_host_state(shost) == SHOST_DEL ||
 		!get_device(&shost->shost_gendev))
 		return NULL;
 	return shost;

index ecd365d78ae3..f0152b043e18 100644
@@ -3072,7 +3072,7 @@ static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
 
 	scmd_printk(KERN_INFO, scmd,
 		"SCSI host state: %d  SCSI host busy: %d  FW outstanding: %d\n",
-		scmd->device->host->shost_state,
+		scsi_get_host_state(scmd->device->host),
 		scsi_host_busy(scmd->device->host),
 		atomic_read(&instance->fw_outstanding));
 	/*

index 402d1f35d214..f80a21ec161b 100644
@@ -5172,7 +5172,7 @@ static enum scsi_qc_status mpi3mr_qcmd(struct Scsi_Host *shost,
 
 	/* Avoid error handling escalation when device is removed or blocked */
 
-	if (scmd->device->host->shost_state == SHOST_RECOVERY &&
+	if (scsi_get_host_state(scmd->device->host) == SHOST_RECOVERY &&
 		scmd->cmnd[0] == TEST_UNIT_READY &&
 		(stgt_priv_data->dev_removed || (dev_handle == MPI3MR_INVALID_DEV_HANDLE))) {
 		scsi_build_sense(scmd, 0, UNIT_ATTENTION, 0x29, 0x07);

index dea78688cc9b..0e12009a87f6 100644
@@ -5472,7 +5472,7 @@ static enum scsi_qc_status scsih_qcmd(struct Scsi_Host *shost,
 	 * Avoid error handling escallation when device is disconnected
 	 */
 	if (handle == MPT3SAS_INVALID_DEVICE_HANDLE || sas_device_priv_data->block) {
-		if (scmd->device->host->shost_state == SHOST_RECOVERY &&
+		if (scsi_get_host_state(scmd->device->host) == SHOST_RECOVERY &&
 		    scmd->cmnd[0] == TEST_UNIT_READY) {
 			scsi_build_sense(scmd, 0, UNIT_ATTENTION, 0x29, 0x07);
 			scsi_done(scmd);

index d598ab4126f8..c9d9fc7c81fb 100644
@@ -9411,11 +9411,9 @@ static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
  * This routine finds that if reset host is called in EH
  * scenario or from some application like sg_reset
  **/
-static int qla4xxx_is_eh_active(struct Scsi_Host *shost)
+static bool qla4xxx_is_eh_active(struct Scsi_Host *shost)
 {
-	if (shost->shost_state == SHOST_RECOVERY)
-		return 1;
-	return 0;
+	return scsi_get_host_state(shost) == SHOST_RECOVERY;
 }
 
 /**

index 22e2e3223440..89d2e5a70e9b 100644
@@ -1661,10 +1661,9 @@ static enum scsi_qc_status scsi_dispatch_cmd(struct scsi_cmnd *cmd)
 		goto done;
 	}
 
-	if (unlikely(host->shost_state == SHOST_DEL)) {
+	if (unlikely(scsi_get_host_state(host) == SHOST_DEL)) {
 		cmd->result = (DID_NO_CONNECT << 16);
 		goto done;
-
 	}
 
 	trace_scsi_dispatch_cmd_start(cmd);

index dfc3559e7e04..9480432f650b 100644
@@ -214,8 +214,9 @@ store_shost_state(struct device *dev, struct device_attribute *attr,
 	if (!state)
 		return -EINVAL;
 
-	if (scsi_host_set_state(shost, state))
-		return -EINVAL;
+	scoped_guard(spinlock_irq, shost->host_lock)
+		if (scsi_host_set_state(shost, state))
+			return -EINVAL;
 	return count;
 }
 

@@ -223,7 +224,7 @@ static ssize_t
 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *shost = class_to_shost(dev);
-	const char *name = scsi_host_state_name(shost->shost_state);
+	const char *name = scsi_host_state_name(scsi_get_host_state(shost));
 
 	if (!name)
 		return -EINVAL;

index 7e2011830ba4..69d432fd8e32 100644
@@ -727,7 +727,7 @@ struct Scsi_Host {
 	unsigned int  irq;
 	
 
-	enum scsi_host_state shost_state;
+	enum scsi_host_state shost_state __guarded_by(host_lock);
 
 	/* ldm bits */
 	struct device		shost_gendev, shost_dev;

@@ -785,11 +785,18 @@ static inline struct Scsi_Host *dev_to_shost(struct device *dev)
 	return container_of(dev, struct Scsi_Host, shost_gendev);
 }
 
+static inline enum scsi_host_state scsi_get_host_state(struct Scsi_Host *shost)
+{
+	return context_unsafe(READ_ONCE(shost->shost_state));
+}
+
 static inline int scsi_host_in_recovery(struct Scsi_Host *shost)
 {
-	return shost->shost_state == SHOST_RECOVERY ||
-		shost->shost_state == SHOST_CANCEL_RECOVERY ||
-		shost->shost_state == SHOST_DEL_RECOVERY ||
+	enum scsi_host_state state = scsi_get_host_state(shost);
+
+	return state == SHOST_RECOVERY ||
+		state == SHOST_CANCEL_RECOVERY ||
+		state == SHOST_DEL_RECOVERY ||
 		shost->tmf_in_progress;
 }
 

@@ -835,8 +842,9 @@ static inline struct device *scsi_get_device(struct Scsi_Host *shost)
  **/
 static inline int scsi_host_scan_allowed(struct Scsi_Host *shost)
 {
-	return shost->shost_state == SHOST_RUNNING ||
-	       shost->shost_state == SHOST_RECOVERY;
+	enum scsi_host_state state = scsi_get_host_state(shost);
+
+	return state == SHOST_RUNNING || state == SHOST_RECOVERY;
 }
 
 extern void scsi_unblock_requests(struct Scsi_Host *);

@@ -940,6 +948,7 @@ static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost)
 	return shost->prot_guard_type;
 }
 
-extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state);
+int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
+	__must_hold(shost->host_lock);
 
 #endif /* _SCSI_SCSI_HOST_H */