linux-kernel - Re: [PATCH 2/2] crypto/ccp: Cleanup sp_dev_master in psp_dev

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Date:   Fri, 6 Mar 2020 09:57:17 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     John Allen <john.allen@....com>, linux-crypto@...r.kernel.org
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        brijesh.singh@....com, bp@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] crypto/ccp: Cleanup sp_dev_master in
 psp_dev_destroy()

On 3/3/20 7:57 AM, John Allen wrote:
> Introduce clear_psp_master_device() to ensure that sp_dev_master gets
> properly cleared on the release of a psp device.
> 
> Fixes: 2a6170dfe755 ("crypto: ccp: Add Platform Security Processor (PSP) device support")
> Signed-off-by: John Allen <john.allen@....com>

Acked-by: Tom Lendacky <thomas.lendacky@....com>

> ---
>  drivers/crypto/ccp/psp-dev.c | 3 +++
>  drivers/crypto/ccp/sp-dev.h  | 1 +
>  drivers/crypto/ccp/sp-pci.c  | 9 +++++++++
>  3 files changed, 13 insertions(+)
> 
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index e95e7aa5dbf1..ae7b44599914 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -215,6 +215,9 @@ void psp_dev_destroy(struct sp_device *sp)
>  	tee_dev_destroy(psp);
>  
>  	sp_free_psp_irq(sp, psp);
> +
> +	if (sp->clear_psp_master_device)
> +		sp->clear_psp_master_device(sp);
>  }
>  
>  void psp_set_sev_irq_handler(struct psp_device *psp, psp_irq_handler_t handler,
> diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
> index 423594608ad1..f913f1494af9 100644
> --- a/drivers/crypto/ccp/sp-dev.h
> +++ b/drivers/crypto/ccp/sp-dev.h
> @@ -90,6 +90,7 @@ struct sp_device {
>  	/* get and set master device */
>  	struct sp_device*(*get_psp_master_device)(void);
>  	void (*set_psp_master_device)(struct sp_device *);
> +	void (*clear_psp_master_device)(struct sp_device *);
>  
>  	bool irq_registered;
>  	bool use_tasklet;
> diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c
> index 56c1f61c0f84..cb6cb47053f4 100644
> --- a/drivers/crypto/ccp/sp-pci.c
> +++ b/drivers/crypto/ccp/sp-pci.c
> @@ -146,6 +146,14 @@ static struct sp_device *psp_get_master(void)
>  	return sp_dev_master;
>  }
>  
> +static void psp_clear_master(struct sp_device *sp)
> +{
> +	if (sp == sp_dev_master) {
> +		sp_dev_master = NULL;
> +		dev_dbg(sp->dev, "Cleared sp_dev_master\n");
> +	}
> +}
> +
>  static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  {
>  	struct sp_device *sp;
> @@ -206,6 +214,7 @@ static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	pci_set_master(pdev);
>  	sp->set_psp_master_device = psp_set_master;
>  	sp->get_psp_master_device = psp_get_master;
> +	sp->clear_psp_master_device = psp_clear_master;
>  
>  	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
>  	if (ret) {
>