From 0255b1e3d84962f8f8d19f9e2768a8a4f0de7487 Mon Sep 17 00:00:00 2001
From: Stanley Chu <stanley.chu@mediatek.com>
Date: Fri, 24 Jul 2020 22:16:27 +0800
Subject: [PATCH] scsi: ufs-mediatek: Prevent LPM operation on undeclared VCC
In some platforms, VCC regulator may not be declared in device tree to keep
itself "always-on". In this case, hba->vreg_info.vcc is NULL and shall not
be operated during any flow.
Prevent possible NULL hba->vreg_info.vcc access in LPM mode by checking
if it is valid first.
Link: https://lore.kernel.org/r/20200724141627.20094-1-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/ufs/ufs-mediatek.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 31af8b3d2b538..66223fe200fc9 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -574,7 +574,7 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
{
- if (!hba->vreg_info.vccq2)
+ if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc)
return;
if (lpm & !hba->vreg_info.vcc->enabled)
--
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