[PATCH v8 10/13] scsi/scsi_error: Use call_rcu_flush() instead of call_rcu()

[Joel Fernandes (Google)]

From: Uladzislau Rezki <urezki@xxxxxxxxx>

Slow boot time is seen on KVM running typical Linux distributions due to
SCSI layer calling call_rcu(). Recent changes to save power may be
causing this slowness. Using call_rcu_flush() fixes the issue and brings
the boot time back to what it originally was. Convert it.

Tested-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Uladzislau Rezki <urezki@xxxxxxxxx>
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
---
 drivers/scsi/scsi_error.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 448748e3fba5..a56cfd612e3a 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -312,7 +312,7 @@ void scsi_eh_scmd_add(struct scsi_cmnd *scmd)
 	 * Ensure that all tasks observe the host state change before the
 	 * host_failed change.
 	 */
-	call_rcu(&scmd->rcu, scsi_eh_inc_host_failed);
+	call_rcu_flush(&scmd->rcu, scsi_eh_inc_host_failed);
 }
 
 /**
-- 
2.38.0.rc1.362.ged0d419d3c-goog