Re: [PATCH] drm/msm: Fix uninitialized var usage in dsi_phy_28nm_8960.c

[Rob Clark <robdclark@gmail.com>]

On Fri, May 7, 2021 at 7:16 AM Sean Paul <sean@poorly.run> wrote:
>
> From: Sean Paul <seanpaul@chromium.org>
>
> This patch fixes the following error:
>
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c:425:11: error: variable 'parent_name' is uninitialized when used here
> [-Werror,-Wuninitialized]
>         snprintf(parent_name, 32, "dsi%dvco_clk", pll_28nm->phy->id);
>                  ^~~~~~~~~~~
> drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c:385:30:
> note: initialize the variable 'parent_name' to silence this warning
>         char *clk_name, *parent_name, *vco_name;
>                                     ^
>                                      = NULL
> 1 error generated.
> make[5]: ***
> [scripts/Makefile.build:279: drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.o] Error 1
>
> It looks like the allocation was inadvertently deleted.
>
> Fixes: 5d13459650b3 ("drm/msm/dsi: push provided clocks handling into a generic code")
>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Cc: Stephen Boyd <swboyd@chromium.org>
> Cc: Abhinav Kumar <abhinavk@codeaurora.org>
> Cc: Rob Clark <robdclark@chromium.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>

Thanks, I'll pick this up for next -fixes pr

BR,
-R

> ---
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> index 582b1428f971..86e40a0d41a3 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
> @@ -405,6 +405,10 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
>         if (!vco_name)
>                 return -ENOMEM;
>
> +       parent_name = devm_kzalloc(dev, 32, GFP_KERNEL);
> +       if (!parent_name)
> +               return -ENOMEM;
> +
>         clk_name = devm_kzalloc(dev, 32, GFP_KERNEL);
>         if (!clk_name)
>                 return -ENOMEM;
> --
> Sean Paul, Software Engineer, Google / Chromium OS
>