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Message-ID: <SN6PR04MB4640BB7521A48396F6696157FC720@SN6PR04MB4640.namprd04.prod.outlook.com>
Date: Mon, 27 Jul 2020 10:56:12 +0000
From: Avri Altman <Avri.Altman@....com>
To: Stanley Chu <stanley.chu@...iatek.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
"bvanassche@....org" <bvanassche@....org>
CC: "beanhuo@...ron.com" <beanhuo@...ron.com>,
"asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
"cang@...eaurora.org" <cang@...eaurora.org>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
"linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
"peter.wang@...iatek.com" <peter.wang@...iatek.com>,
"chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
"andy.teng@...iatek.com" <andy.teng@...iatek.com>,
"chaotian.jing@...iatek.com" <chaotian.jing@...iatek.com>,
"cc.chou@...iatek.com" <cc.chou@...iatek.com>
Subject: RE: [PATCH v1] 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.
>
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Avri Altman <avri.altman@....com>
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