linux-kernel - Re: [tpmdd-devel] [PATCH] tpm_crb: drop struct resource res from struct crb

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Date:	Tue, 15 Mar 2016 20:44:24 -0400
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH] tpm_crb: drop struct resource res from
 struct crb_priv

On 03/15/2016 05:36 PM, Jarkko Sakkinen wrote:
> The iomem resource is needed only temporarily so it is better to pass
> it on instead of storing it permanently. Named the variable as io_res
> so that the code better documents itself.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Reviewed-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>


> ---
>   drivers/char/tpm/tpm_crb.c | 29 ++++++++++++++++-------------
>   1 file changed, 16 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> index a12b319..8e02c44 100644
> --- a/drivers/char/tpm/tpm_crb.c
> +++ b/drivers/char/tpm/tpm_crb.c
> @@ -77,7 +77,6 @@ enum crb_flags {
>
>   struct crb_priv {
>   	unsigned int flags;
> -	struct resource res;
>   	void __iomem *iobase;
>   	struct crb_control_area __iomem *cca;
>   	u8 __iomem *cmd;
> @@ -224,19 +223,19 @@ static int crb_init(struct acpi_device *device, struct crb_priv *priv)
>
>   static int crb_check_resource(struct acpi_resource *ares, void *data)
>   {
> -	struct crb_priv *priv = data;
> +	struct resource *io_res = data;
>   	struct resource res;
>
>   	if (acpi_dev_resource_memory(ares, &res)) {
> -		priv->res = res;
> -		priv->res.name = NULL;
> +		*io_res = res;
> +		io_res->name = NULL;
>   	}
>
>   	return 1;
>   }
>
>   static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv,
> -				 u64 start, u32 size)
> +				 struct resource *io_res, u64 start, u32 size)
>   {
>   	struct resource new_res = {
>   		.start	= start,
> @@ -248,50 +247,54 @@ static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv,
>   	if (start != new_res.start)
>   		return ERR_PTR(-EINVAL);
>
> -	if (!resource_contains(&priv->res, &new_res))
> +	if (!resource_contains(io_res, &new_res))
>   		return devm_ioremap_resource(dev, &new_res);
>
> -	return priv->iobase + (new_res.start - priv->res.start);
> +	return priv->iobase + (new_res.start - io_res->start);
>   }
>
>   static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
>   		      struct acpi_table_tpm2 *buf)
>   {
>   	struct list_head resources;
> +	struct resource io_res;
>   	struct device *dev = &device->dev;
>   	u64 pa;
>   	int ret;
>
>   	INIT_LIST_HEAD(&resources);
>   	ret = acpi_dev_get_resources(device, &resources, crb_check_resource,
> -				     priv);
> +				     &io_res);
>   	if (ret < 0)
>   		return ret;
>   	acpi_dev_free_resource_list(&resources);
>
> -	if (resource_type(&priv->res) != IORESOURCE_MEM) {
> +	if (resource_type(&io_res) != IORESOURCE_MEM) {
>   		dev_err(dev,
>   			FW_BUG "TPM2 ACPI table does not define a memory resource\n");
>   		return -EINVAL;
>   	}
>
> -	priv->iobase = devm_ioremap_resource(dev, &priv->res);
> +	priv->iobase = devm_ioremap_resource(dev, &io_res);
>   	if (IS_ERR(priv->iobase))
>   		return PTR_ERR(priv->iobase);
>
> -	priv->cca = crb_map_res(dev, priv, buf->control_address, 0x1000);
> +	priv->cca = crb_map_res(dev, priv, &io_res, buf->control_address,
> +				0x1000);
>   	if (IS_ERR(priv->cca))
>   		return PTR_ERR(priv->cca);
>
>   	pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) |
>   	      (u64) ioread32(&priv->cca->cmd_pa_low);
> -	priv->cmd = crb_map_res(dev, priv, pa, ioread32(&priv->cca->cmd_size));
> +	priv->cmd = crb_map_res(dev, priv, &io_res, pa,
> +				ioread32(&priv->cca->cmd_size));
>   	if (IS_ERR(priv->cmd))
>   		return PTR_ERR(priv->cmd);
>
>   	memcpy_fromio(&pa, &priv->cca->rsp_pa, 8);
>   	pa = le64_to_cpu(pa);
> -	priv->rsp = crb_map_res(dev, priv, pa, ioread32(&priv->cca->rsp_size));
> +	priv->rsp = crb_map_res(dev, priv, &io_res, pa,
> +				ioread32(&priv->cca->rsp_size));
>   	return PTR_ERR_OR_ZERO(priv->rsp);
>   }
>