Re: [alsa-devel] [PATCH v7 1/6] ASoC: amd:Create multiple I2S platform device endpoint

[Dan Carpenter <dan.carpenter@oracle.com>]

On Mon, Nov 18, 2019 at 07:34:16PM +0530, Ravulapati Vishnu vardhan rao wrote:
>  static int snd_acp3x_probe(struct pci_dev *pci,
>  			   const struct pci_device_id *pci_id)
>  {
> -	int ret;
> -	u32 addr, val;
>  	struct acp3x_dev_data *adata;
> -	struct platform_device_info pdevinfo;
> +	struct platform_device_info pdevinfo[ACP3x_DEVS];
>  	unsigned int irqflags;
> +	int ret, val, i;
> +	u32 addr;
>  
>  	if (pci_enable_device(pci)) {
>  		dev_err(&pci->dev, "pci_enable_device failed\n");
> @@ -40,10 +40,10 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  	}
>  
>  	adata = devm_kzalloc(&pci->dev, sizeof(struct acp3x_dev_data),
> -			     GFP_KERNEL);
> +							     GFP_KERNEL);
>  	if (!adata) {
>  		ret = -ENOMEM;
> -		goto release_regions;
> +		goto adata_free;
>  	}
>  
>  	/* check for msi interrupt support */
> @@ -56,7 +56,8 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  		irqflags = 0;
>  
>  	addr = pci_resource_start(pci, 0);
> -	adata->acp3x_base = ioremap(addr, pci_resource_len(pci, 0));
> +	adata->acp3x_base = devm_ioremap(&pci->dev, addr,
> +					pci_resource_len(pci, 0));
>  	if (!adata->acp3x_base) {
>  		ret = -ENOMEM;
>  		goto release_regions;
> @@ -68,11 +69,11 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  	switch (val) {
>  	case I2S_MODE:
>  		adata->res = devm_kzalloc(&pci->dev,
> -					  sizeof(struct resource) * 2,
> +					  sizeof(struct resource) * 4,
>  					  GFP_KERNEL);
>  		if (!adata->res) {
>  			ret = -ENOMEM;
> -			goto unmap_mmio;
> +			goto release_regions;
>  		}
>  
>  		adata->res[0].name = "acp3x_i2s_iomem";
> @@ -80,28 +81,52 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  		adata->res[0].start = addr;
>  		adata->res[0].end = addr + (ACP3x_REG_END - ACP3x_REG_START);
>  
> -		adata->res[1].name = "acp3x_i2s_irq";
> -		adata->res[1].flags = IORESOURCE_IRQ;
> -		adata->res[1].start = pci->irq;
> -		adata->res[1].end = pci->irq;
> +		adata->res[1].name = "acp3x_i2s_sp";
> +		adata->res[1].flags = IORESOURCE_MEM;
> +		adata->res[1].start = addr + ACP3x_I2STDM_REG_START;
> +		adata->res[1].end = addr + ACP3x_I2STDM_REG_END;
> +
> +		adata->res[2].name = "acp3x_i2s_bt";
> +		adata->res[2].flags = IORESOURCE_MEM;
> +		adata->res[2].start = addr + ACP3x_BT_TDM_REG_START;
> +		adata->res[2].end = addr + ACP3x_BT_TDM_REG_END;
> +
> +		adata->res[3].name = "acp3x_i2s_irq";
> +		adata->res[3].flags = IORESOURCE_IRQ;
> +		adata->res[3].start = pci->irq;
> +		adata->res[3].end = adata->res[3].start;
>  
>  		adata->acp3x_audio_mode = ACP3x_I2S_MODE;
>  
>  		memset(&pdevinfo, 0, sizeof(pdevinfo));
> -		pdevinfo.name = "acp3x_rv_i2s";
> -		pdevinfo.id = 0;
> -		pdevinfo.parent = &pci->dev;
> -		pdevinfo.num_res = 2;
> -		pdevinfo.res = adata->res;
> -		pdevinfo.data = &irqflags;
> -		pdevinfo.size_data = sizeof(irqflags);
> -
> -		adata->pdev = platform_device_register_full(&pdevinfo);
> -		if (IS_ERR(adata->pdev)) {
> -			dev_err(&pci->dev, "cannot register %s device\n",
> -				pdevinfo.name);
> -			ret = PTR_ERR(adata->pdev);
> -			goto unmap_mmio;
> +		pdevinfo[0].name = "acp3x_rv_i2s_dma";
> +		pdevinfo[0].id = 0;
> +		pdevinfo[0].parent = &pci->dev;
> +		pdevinfo[0].num_res = 4;
> +		pdevinfo[0].res = &adata->res[0];
> +		pdevinfo[0].data = &irqflags;
> +		pdevinfo[0].size_data = sizeof(irqflags);
> +
> +		pdevinfo[1].name = "acp3x_i2s_playcap";
> +		pdevinfo[1].id = 0;
> +		pdevinfo[1].parent = &pci->dev;
> +		pdevinfo[1].num_res = 1;
> +		pdevinfo[1].res = &adata->res[1];
> +
> +		pdevinfo[2].name = "acp3x_i2s_playcap";
> +		pdevinfo[2].id = 1;
> +		pdevinfo[2].parent = &pci->dev;
> +		pdevinfo[2].num_res = 1;
> +		pdevinfo[2].res = &adata->res[2];
> +		for (i = 0; i < ACP3x_DEVS ; i++) {
> +			adata->pdev[i] =
> +				platform_device_register_full(&pdevinfo[i]);
> +			if (IS_ERR(adata->pdev[i])) {
> +				dev_err(&pci->dev, "cannot register %s device\n",
> +					pdevinfo[i].name);
> +				ret = PTR_ERR(adata->pdev[i]);
> +				goto unmap_mmio;
> +			}
>  		}
>  		break;
>  	default:
> @@ -112,10 +137,22 @@ static int snd_acp3x_probe(struct pci_dev *pci,
>  	return 0;
>  
>  unmap_mmio:
> +	if (val == I2S_MODE)
> +		for (i = 0 ; i < ACP3x_DEVS ; i++)
> +			platform_device_unregister(adata->pdev[i]);

I really wish you had done this the way, I said.  That's the easiest
way to audit.  Otherwise you have to check that adata->pdev[] is
initialized and that platform_device_unregister() accepts both error
pointers and NULLs.  It does.  But it's easier to audit if you only
free things which have been allocated and never free things which were
not allocated.

> +	devm_kfree(&pci->dev, adata->res);

Don't free devm_ allocated data.  It gets freed for you automatically.

> +	devm_kfree(&pci->dev, adata);
>  	pci_disable_msi(pci);
> -	iounmap(adata->acp3x_base);
> +	pci_release_regions(pci);
> +	pci_disable_device(pci);
>  release_regions:
> +	devm_kfree(&pci->dev, adata);
> +	pci_disable_msi(pci);

This disables the msi twice so it's a double free situation.  It would
have been better to just cut and paste the code that I wrote for you.

regards,
dan carpenter

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