linux-kernel - Re: [PATCH v5 1/8] scsi: ufs: enable WriteBooster on some pre-3.1 UFS devices

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Date:   Fri, 8 May 2020 07:50:57 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Avri Altman <Avri.Altman@....com>
CC:     "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>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "andy.teng@...iatek.com" <andy.teng@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>
Subject: Re: [PATCH v5 1/8] scsi: ufs: enable WriteBooster on some pre-3.1
 UFS devices

Hi Avri,
On Mon, 2020-05-04 at 22:33 +0800, Stanley Chu wrote:
> Hi Avri,
> 
> On Mon, 2020-05-04 at 10:37 +0000, Avri Altman wrote:
> > > 
> > >  static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
> > >  {
> > > +       if (!ufshcd_is_wb_allowed(hba))
> > > +               return;
> > > +
> > > +       if (hba->desc_size.dev_desc <=
> > > DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP)
> > Should be 
> > DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4 
> 
> I think this description length check is redundant because the device
> quirk shall be added only after WriteBooster supportat is confirmed in
> attached UFS device. So I will remove this in next version.

Sorry this statement is incorrect because this kind on devices may have
short (without DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP field) before
firmware upgrading. So the checking for descriptor length is still
required to avoid out-of-boundary access in below codes.

I will add it back in next version and also fix the length.

Thanks,
Stanley Chu

> > 
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
> 

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