Re: [PATCH v4 04/12] scsi: ufs: core: Add support for TX Equalization

[Can Guo <can.guo@oss.qualcomm.com>]

On 3/24/2026 7:54 PM, Peter Wang (王信友) wrote:
>
> On Tue, 2026-03-24 at 18:09 +0800, Can Guo wrote:
> > > > +       params = &hba->tx_eq_params[gear - 1];
> > > > +
> > > > +       if (gear < UFS_HS_G1 || gear > UFS_HS_GEAR_MAX) {
> > > > +               dev_err(hba->dev, "Invalid HS-Gear (%u) for TX
> > > > Equalization\n",
> > > > +                       gear);
> > > > +               return -EINVAL;
> > > > +       } else if (gear < adaptive_txeq_gear) {
> > > > +               return 0;
> > > > +       }
> > > > 
> > > 
> > > "gear" should be checked before use?
> > I don't understand this comment.
> > 
>
> Hi Can,
>
> I mean that gear is used here:
> params = &hba->tx_eq_params[gear - 1];
> If gear is 0, it could be dangerous if params is used.
>
> Therefore, we should move this line after the following check:
> if (gear < UFS_HS_G1 || gear > UFS_HS_GEAR_MAX) {
>     ...
> }
You are right...
Let me address it in next version.

Thanks,
Can Guo.
>
> Thanks.
> Peter
>
>
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