linux-kernel - Re: [PATCH] ufs: Reinstate NULL pointer checks for regulators

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Date:	Wed, 29 Apr 2015 09:49:20 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.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>
Subject: Re: [PATCH] ufs: Reinstate NULL pointer checks for regulators

2015-04-16 4:10 GMT+09:00 Bjorn Andersson <bjorn.andersson@...ymobile.com>:
> The cleanup during the introduction of regulator_set_load() was a too
> optimistic and re-opened an issue with vreg being dereferenced while
> being NULL.
>
> So reinstate the NULL checks and add back the BUG_ON() to follow the
> general coding convention of the implementation.
>
> Fixes: 7b16a07c3293 ("ufs: Rename of regulator_set_optimum_mode")
> Reported-by: Akinobu Mita <akinobu.mita@...il.com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>

Tested-by: Akinobu Mita <akinobu.mita@...il.com>

This patch still isn't picked up by scsi tree nor regulator tree.

James, Mark,
Could you consider taking care of this patch?

> ---
>  drivers/scsi/ufs/ufshcd.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 648a44675880..540e00df6de1 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4262,8 +4262,7 @@ static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
>  {
>         int ret;
>
> -       if (!vreg)
> -               return 0;
> +       BUG_ON(!vreg);
>
>         ret = regulator_set_load(vreg->reg, ua);
>         if (ret < 0) {
> @@ -4277,12 +4276,18 @@ static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
>  static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
>                                          struct ufs_vreg *vreg)
>  {
> +       if (!vreg)
> +               return 0;
> +
>         return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
>  }
>
>  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);
>  }
>
> --
> 1.8.2.2
>
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