linux-kernel - Re: [PATCH RESEND v4 08/15] PCI: dwc: Add host de-initialization callback

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Date:   Mon, 1 Aug 2022 19:03:48 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>, Rob Herring <robh+dt@...nel.org>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v4 08/15] PCI: dwc: Add host de-initialization
 callback

On Fri, Jun 24, 2022 at 05:39:40PM +0300, Serge Semin wrote:
> Seeing the platform-specific DW PCIe host-initialization is performed from
> within the generic dw_pcie_host_init() method by means of the dedicated
> dw_pcie_ops.host_init() callback, there must be declared an antagonist
> which would perform the corresponding cleanups. Let's add such callback
> then. It will be called in the dw_pcie_host_deinit() method and in the
> cleanup-on-error path in the dw_pcie_host_init() function.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  .../pci/controller/dwc/pcie-designware-host.c | 21 ++++++++++++++-----
>  drivers/pci/controller/dwc/pcie-designware.h  |  1 +
>  2 files changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index b1437b37140f..4f984c845b59 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -354,13 +354,14 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  			pp->num_vectors = MSI_DEF_NUM_VECTORS;
>  		} else if (pp->num_vectors > MAX_MSI_IRQS) {
>  			dev_err(dev, "Invalid number of vectors\n");
> -			return -EINVAL;
> +			ret = -EINVAL;
> +			goto err_deinit_host;
>  		}
>  
>  		if (pp->ops->msi_host_init) {
>  			ret = pp->ops->msi_host_init(pp);
>  			if (ret < 0)
> -				return ret;
> +				goto err_deinit_host;
>  		} else if (pp->has_msi_ctrl) {
>  			u32 ctrl, num_ctrls;
>  
> @@ -372,8 +373,10 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  				pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
>  				if (pp->msi_irq < 0) {
>  					pp->msi_irq = platform_get_irq(pdev, 0);
> -					if (pp->msi_irq < 0)
> -						return pp->msi_irq;
> +					if (pp->msi_irq < 0) {
> +						ret = pp->msi_irq;
> +						goto err_deinit_host;
> +					}
>  				}
>  			}
>  
> @@ -381,7 +384,7 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  
>  			ret = dw_pcie_allocate_domains(pp);
>  			if (ret)
> -				return ret;
> +				goto err_deinit_host;
>  
>  			if (pp->msi_irq > 0)
>  				irq_set_chained_handler_and_data(pp->msi_irq,
> @@ -434,6 +437,11 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
>  err_free_msi:
>  	if (pp->has_msi_ctrl)
>  		dw_pcie_free_msi(pp);
> +
> +err_deinit_host:
> +	if (pp->ops->host_deinit)
> +		pp->ops->host_deinit(pp);
> +
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_host_init);
> @@ -449,6 +457,9 @@ void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
>  
>  	if (pp->has_msi_ctrl)
>  		dw_pcie_free_msi(pp);
> +
> +	if (pp->ops->host_deinit)
> +		pp->ops->host_deinit(pp);
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
>  
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index d247f227464c..7f1c00fa084d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -200,6 +200,7 @@ enum dw_pcie_device_mode {
>  
>  struct dw_pcie_host_ops {
>  	int (*host_init)(struct dw_pcie_rp *pp);
> +	void (*host_deinit)(struct dw_pcie_rp *pp);
>  	int (*msi_host_init)(struct dw_pcie_rp *pp);
>  };
>  
> -- 
> 2.35.1
> 

-- 
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