linux-kernel - Re: [PATCH] drm/amd/pm: check return value of amdgpu_irq_add

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Message-ID: <7b3ea9a6-575e-4fe5-98d9-6e53803188fa@amd.com>
Date: Tue, 1 Oct 2024 13:14:33 +0200
From: Christian König <christian.koenig@....com>
To: Igor Artemiev <Igor.A.Artemiev@...t.ru>,
 Alex Deucher <alexander.deucher@....com>
Cc: Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>,
 Kenneth Feng <kenneth.feng@....com>, Simona Vetter <simona@...ll.ch>,
 amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] drm/amd/pm: check return value of amdgpu_irq_add_id()

Am 01.10.24 um 12:57 schrieb Igor Artemiev:
> amdgpu_irq_ad_id() may fail and the irq handlers will not be registered.
> This patch adds error code check.
>
> Found by Linux Verification Center (linuxtesting.org) with static
> analysis tool SVACE.
>
> Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
> ---
>   .../drm/amd/pm/powerplay/hwmgr/smu_helper.c   | 19 ++++++++++++++++---
>   1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> index 79a566f3564a..109df1039d5c 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> @@ -647,28 +647,41 @@ int smu9_register_irq_handlers(struct pp_hwmgr *hwmgr)
>   {
>   	struct amdgpu_irq_src *source =
>   		kzalloc(sizeof(struct amdgpu_irq_src), GFP_KERNEL);
> +	int ret;
>   
>   	if (!source)
>   		return -ENOMEM;
>   
>   	source->funcs = &smu9_irq_funcs;
>   
> -	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> +	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),

The cast to struct amdgpu_device should probably be removed.

>   			SOC15_IH_CLIENTID_THM,
>   			THM_9_0__SRCID__THM_DIG_THERM_L2H,
>   			source);

And the parameters indented to the new opening of the (.

Regards,
Christian.

> -	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> +	if (ret)
> +		goto err;
> +
> +	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
>   			SOC15_IH_CLIENTID_THM,
>   			THM_9_0__SRCID__THM_DIG_THERM_H2L,
>   			source);
> +	if (ret)
> +		goto err;
>   
>   	/* Register CTF(GPIO_19) interrupt */
> -	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> +	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
>   			SOC15_IH_CLIENTID_ROM_SMUIO,
>   			SMUIO_9_0__SRCID__SMUIO_GPIO19,
>   			source);
> +	if (ret)
> +		goto err;
>   
>   	return 0;
> +
> +err:
> +	kfree(source);
> +
> +	return ret;
>   }
>   
>   void *smu_atom_get_data_table(void *dev, uint32_t table, uint16_t *size,