linux-kernel - Re: [PATCH v2] drm/msm/dsi: Fix the releasing of resources in error path in 'dsi_bus_clk

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Date:   Sun, 26 Feb 2017 15:28:44 +0100
From:   walter harms <wharms@....de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
CC:     robdclark@...il.com, airlied@...ux.ie, architt@...eaurora.org,
        hali@...eaurora.org, yongjun_wei@...ndmicro.com.cn,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dsi: Fix the releasing of resources in error
 path in 'dsi_bus_clk_enable()'

looks good to me.

Reviewed-by: wharms@....de

Am 26.02.2017 13:10, schrieb Christophe JAILLET:
> If a 'clk_prepare_enable()' fails, then we need to disable_unprepare the
> clk already handled.
> 
> With the current implemenatation, we try to do that on the clk that has
> triggered the error, which is a no-op and leave msm_host->bus_clks[0]
> untouched.
> 
> Count forward in order to fix it and be more future proof.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> v2: change the for loop from a backward to a forward one, to ease reading.
> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 1fc07ce24686..e6f56cd8ce08 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -422,7 +422,7 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
>  static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
>  {
>  	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
> -	int i, ret;
> +	int i, j, ret;
>  
>  	DBG("id=%d", msm_host->id);
>  
> @@ -437,8 +437,8 @@ static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
>  
>  	return 0;
>  err:
> -	for (; i > 0; i--)
> -		clk_disable_unprepare(msm_host->bus_clks[i]);
> +	for (j = 0; j < i; j++)
> +		clk_disable_unprepare(msm_host->bus_clks[j]);
>  
>  	return ret;
>  }