linux-kernel - RE: [PATCH] crypto: tegra - Remove an incorrect iommu_fwspec_free() call in tegra_se

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Date: Wed, 29 May 2024 06:40:56 +0000
From: Akhil R <akhilrajeev@...dia.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>, Herbert Xu
	<herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>,
	Thierry Reding <thierry.reding@...il.com>, Jon Hunter <jonathanh@...dia.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>, Mikko Perttunen
	<mperttunen@...dia.com>
Subject: RE: [PATCH] crypto: tegra - Remove an incorrect iommu_fwspec_free()
 call in tegra_se_remove()

> 
> The only iommu function call in this driver is a
> tegra_dev_iommu_get_stream_id() which does not allocate anything and does
> not take any reference.
> 
> More-over, what is freed is "se->dev" which has been devm_kzalloc()'ed in the
> probe.
> 
> So there is no point in calling iommu_fwspec_free() in the remove function.
> 
> Remove this incorrect function call.
> 
> Fixes: 0880bb3b00c8 ("crypto: tegra - Add Tegra Security Engine driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Compile tested only
> 
> This patch is completely speculative. *Review with care*.
> ---
>  drivers/crypto/tegra/tegra-se-main.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/crypto/tegra/tegra-se-main.c b/drivers/crypto/tegra/tegra-se-
> main.c
> index 9955874b3dc3..f94c0331b148 100644
> --- a/drivers/crypto/tegra/tegra-se-main.c
> +++ b/drivers/crypto/tegra/tegra-se-main.c
> @@ -326,7 +326,6 @@ static void tegra_se_remove(struct platform_device
> *pdev)
> 
>         crypto_engine_stop(se->engine);
>         crypto_engine_exit(se->engine);
> -       iommu_fwspec_free(se->dev);
>         host1x_client_unregister(&se->client);
>  }
> 

This was a futile attempt to fix a kmemleak warning in host1x_client_unregister() in a very old kernel.
I don't see it anymore, either with or without this change. So,

Tested-by: Akhil R <akhilrajeev@...dia.com>
Acked-by: Akhil R <akhilrajeev@...dia.com>

Regards,
Akhil