blob: 55d57ecba609f252fe87b3482890e4bea4b2857a [file] [log] [blame]
From a2640cc3abee147f9adeb6ca4431c4fd4c5dbf7b Mon Sep 17 00:00:00 2001
From: Stanley Chu <>
Date: Wed, 18 Sep 2019 12:20:38 +0800
Subject: [PATCH] scsi: ufs: skip shutdown if hba is not powered
commit f51913eef23f74c3bd07899dc7f1ed6df9e521d8 upstream.
In some cases, hba may go through shutdown flow without successful
initialization and then make system hang.
For example, if ufshcd_change_power_mode() gets error and leads to
ufshcd_hba_exit() to release resources of the host, future shutdown flow
may hang the system since the host register will be accessed in unpowered
To solve this issue, simply add checking to skip shutdown for above kind of
Signed-off-by: Stanley Chu <>
Acked-by: Bean Huo <>
Signed-off-by: Martin K. Petersen <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index aa3bfc20b737..d485eaa90731 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8065,6 +8065,9 @@ int ufshcd_shutdown(struct ufs_hba *hba)
int ret = 0;
+ if (!hba->is_powered)
+ goto out;
if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
goto out;