[PATCH] mmc: sdhci-brcmstb: Initialize base_clk to NULL in sdhci_brcmstb_probe()

[Adrian Hunter]

On 8/06/22 18:27, Nathan Chancellor wrote:
> Clang warns a few times along the lines of:
> 
>   drivers/mmc/host/sdhci-brcmstb.c:302:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
>           if (res)
>               ^~~
>   drivers/mmc/host/sdhci-brcmstb.c:376:24: note: uninitialized use occurs here
>           clk_disable_unprepare(base_clk);
>                                 ^~~~~~~~
> 
> base_clk is used in the error path before it is initialized. Initialize
> it to NULL, as clk_disable_unprepare() calls clk_disable() and
> clk_unprepare(), which both handle NULL pointers gracefully.
> 
> Fixes: 2cecaac1b21c ("mmc: sdhci-brcmstb: Add ability to increase max clock rate for 72116b0")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1650
> Reported-by: kernel test robot <lkp at intel.com>
> Signed-off-by: Nathan Chancellor <nathan at kernel.org>

Acked-by: Adrian Hunter <adrian.hunter at intel.com>

> ---
>  drivers/mmc/host/sdhci-brcmstb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
> index f8dff8537920..28e9cf995c41 100644
> --- a/drivers/mmc/host/sdhci-brcmstb.c
> +++ b/drivers/mmc/host/sdhci-brcmstb.c
> @@ -256,7 +256,7 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
>  	struct sdhci_host *host;
>  	struct resource *iomem;
>  	struct clk *clk;
> -	struct clk *base_clk;
> +	struct clk *base_clk = NULL;
>  	int res;
>  
>  	match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
> 
> base-commit: 10980053142d8a3e86eb4d3014574424b42b7a45