linux-kernel - Re: [PATCH 2/2] firmware: stratix10-svc: fix bug in saving controller data

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Message-ID: <0ee36aa1-a50c-fb3d-8b87-5eddf7fe2d3d@kernel.org>
Date:   Tue, 20 Jun 2023 09:26:50 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     tien.sung.ang@...el.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] firmware: stratix10-svc: fix bug in saving controller
 data

Please add a Fixes tag to this!

On 6/19/23 22:52, tien.sung.ang@...el.com wrote:
> From: Ang Tien Sung <tien.sung.ang@...el.com>
> 
> Fix the incorrect usage of platform_set_drvdata and dev_set_drvdata.
> They both are of the same data and overrides each other. This resulted
> in the rmmod of the svc driver to fail and throw a kernel panic
> for kthread_stop and fifo free.
> 
> Signed-off-by: Ang Tien Sung <tien.sung.ang@...el.com>
> ---
>   drivers/firmware/stratix10-svc.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
> index ca713f39107e..60e08987c402 100644
> --- a/drivers/firmware/stratix10-svc.c
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -130,6 +130,7 @@ struct stratix10_svc_data {
>    * @complete_status: state for completion
>    * @invoke_fn: function to issue secure monitor call or hypervisor call
>    * @sdm_lock: a mutex lock to allow only one pending sdm message per client
> + * @svc: manages the list of client svc drivers
>    *
>    * This struct is used to create communication channels for service clients, to
>    * handle secure monitor or hypervisor call.
> @@ -144,6 +145,7 @@ struct stratix10_svc_controller {
>   	svc_invoke_fn *invoke_fn;
>   	/* Enforces atomic command sending to SDM */
>   	struct mutex *sdm_lock;
> +	struct stratix10_svc *svc;
>   };
>   
>   /**
> @@ -1252,6 +1254,7 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
>   		ret = -ENOMEM;
>   		goto err_free_kfifo;
>   	}
> +	controller->svc = svc;
>   
>   	svc->stratix10_svc_rsu = platform_device_alloc(STRATIX10_RSU, 0);
>   	if (!svc->stratix10_svc_rsu) {
> @@ -1279,8 +1282,6 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
>   		goto err_unregister_dev;
>   	}
>   
> -	dev_set_drvdata(dev, svc);
> -
>   	pr_info("Intel Service Layer Driver Initialized\n");
>   
>   	return 0;
> @@ -1296,8 +1297,8 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
>   
>   static int stratix10_svc_drv_remove(struct platform_device *pdev)
>   {
> -	struct stratix10_svc *svc = dev_get_drvdata(&pdev->dev);
>   	struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev);
> +	struct stratix10_svc *svc = ctrl->svc;
>   
>   	platform_device_unregister(svc->intel_svc_fcs);
>   	platform_device_unregister(svc->stratix10_svc_rsu);