linux-kernel - Re: [PATCH v2 2/5] PCI: dwc: Free the page for MSI IRQ in dw_pcie_free

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Date:   Wed, 13 Mar 2019 10:12:06 +0000
From:   Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/5] PCI: dwc: Free the page for MSI IRQ in
 dw_pcie_free_msi()

Hi,

On 01/03/2019 05:04, Jisheng Zhang wrote:
> To avoid memory leak, we need to free the page for MSI in
> dw_pcie_free_msi().
> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 3 +++
>  drivers/pci/controller/dwc/pcie-designware.h      | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index a94d3530b694..abe3ff5f0867 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -305,6 +305,8 @@ void dw_pcie_free_msi(struct pcie_port *pp)
>  
>  	irq_domain_remove(pp->msi_domain);
>  	irq_domain_remove(pp->irq_domain);
> +
> +	__free_page(pp->msi_page);

Perhaps you could test is msi_page is null or not before the free.

>  }
>  
>  void dw_pcie_msi_init(struct pcie_port *pp)
> @@ -322,6 +324,7 @@ void dw_pcie_msi_init(struct pcie_port *pp)
>  		return;
>  	}
>  	msi_target = (u64)pp->msi_data;
> +	pp->msi_page = page;

And maybe use the pp->msi_page variable from the beginning of the function, that
way is one less variable.

Regards,
Gustavo

>  
>  	/* Program the msi_data */
>  	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index f6fb65a40f10..3be7ca9f1fc3 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -179,6 +179,7 @@ struct pcie_port {
>  	struct irq_domain	*irq_domain;
>  	struct irq_domain	*msi_domain;
>  	dma_addr_t		msi_data;
> +	struct page		*msi_page;
>  	u32			num_vectors;
>  	u32			irq_mask[MAX_MSI_CTRLS];
>  	raw_spinlock_t		lock;
>