linux-kernel - RE: [PATCH v1] scsi: ufs-mediatek: Prevent LPM operation on undeclared VCC

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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>