linux-kernel - Re: [PATCH 2/5] ufs: Rename of regulator_set_optimum

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Date:	Wed, 15 Apr 2015 11:35:16 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
CC:	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Mark Brown <broonie@...nel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 2/5] ufs: Rename of regulator_set_optimum_mode

On Tue 14 Apr 05:11 PDT 2015, Akinobu Mita wrote:

> 2015-02-12 12:35 GMT+09:00 Bjorn Andersson <bjorn.andersson@...ymobile.com>:
> > The function regulator_set_optimum_mode() is changing name to
> > regulator_set_load(), so update the code accordingly. Also cleaned up
> > ufshcd_config_vreg_load() while touching the code.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>

[..]

> >  static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
> >                                          struct ufs_vreg *vreg)
> >  {
> > -       if (!vreg)
> > -               return 0;
> > -
> >         return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
> >  }
> 
> I tried this patch and it caused kernel null pointer dereference with
> 'verg->max_uA' when vreg == NULL.  So you can't simply move !vreg check here
> into ufshcd_config_vreg_load().

Akinobu-san, you're correct, sorry for missing that (and in essence
reverting your commit).

Looks like Linus merged the fix on master, so I will send out a fixup.

Regards,
Bjorn
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