linux-kernel - Re: [PATCH] firmware: tegra: adjust tested variable

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Date:   Sat, 27 Jan 2018 17:03:12 +0200
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Julia Lawall <Julia.Lawall@...6.fr>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     kernel-janitors@...r.kernel.org,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: tegra: adjust tested variable

Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>

On 01/27/2018 04:28 PM, Julia Lawall wrote:
> Check the variable that was most recently initialized.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x, y, f, g, e, m;
> statement S1,S2,S3,S4;
> @@
> 
> x = f(...);
> if (\(<+...x...+>\&e\)) S1 else S2
> (
> x = g(...);
> |
> m = g(...,&x,...);
> |
> y = g(...);
> *if (e)
>   S3 else S4
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>   drivers/firmware/tegra/bpmp.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
> index a7f461f..96362b5 100644
> --- a/drivers/firmware/tegra/bpmp.c
> +++ b/drivers/firmware/tegra/bpmp.c
> @@ -732,7 +732,7 @@ static int tegra_bpmp_probe(struct platform_device *pdev)
>   	}
>   
>   	bpmp->rx.virt = gen_pool_dma_alloc(bpmp->rx.pool, 4096, &bpmp->rx.phys);
> -	if (!bpmp->rx.pool) {
> +	if (!bpmp->rx.virt) {
>   		dev_err(&pdev->dev, "failed to allocate from RX pool\n");
>   		err = -ENOMEM;
>   		goto free_tx;
> 
> --
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