[PATCH v2 1/2] ufs: core: Only call scsi_host_busy() after the SCSI host has been added

[Bart Van Assche <bvanassche@acm.org>]

scsi_host_busy() iterates over the host tag set. The host tag set is
initialized by scsi_mq_setup_tags(). The latter function is called by
scsi_add_host(). Hence only call scsi_host_busy() after the SCSI host
has been added. This patch prepares for reverting commit a0b7780602b1
("scsi: core: Fix a regression triggered by scsi_host_busy()").

Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/ufs/core/ufshcd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 562d8cffc6f6..69630677b23f 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -283,7 +283,8 @@ static bool ufshcd_has_pending_tasks(struct ufs_hba *hba)
 
 static bool ufshcd_is_ufs_dev_busy(struct ufs_hba *hba)
 {
-	return scsi_host_busy(hba->host) || ufshcd_has_pending_tasks(hba);
+	return (hba->scsi_host_added && scsi_host_busy(hba->host)) ||
+		ufshcd_has_pending_tasks(hba);
 }
 
 static const struct ufs_dev_quirk ufs_fixups[] = {
@@ -678,7 +679,8 @@ static void ufshcd_print_host_state(struct ufs_hba *hba)
 
 	dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
 	dev_err(hba->dev, "%d outstanding reqs, tasks=0x%lx\n",
-		scsi_host_busy(hba->host), hba->outstanding_tasks);
+		hba->scsi_host_added ? scsi_host_busy(hba->host) : 0,
+		hba->outstanding_tasks);
 	dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
 		hba->saved_err, hba->saved_uic_err);
 	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",