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Subject: Re: [PATCH] genirq/msi: Fix unpaired calls in msi
To:     <maz@kernel.org>, <tglx@linutronix.de>
CC:     <john.wanghui@huawei.com>, <yangyingliang@huawei.com>,
        <dingtianhong@huawei.com>, <wangxiongfeng2@huawei.com>,
        <linux-kernel@vger.kernel.org>
References: <20210518033117.78104-1-cuibixuan@huawei.com>
From:   Bixuan Cui <cuibixuan@huawei.com>
Message-ID: <70ac79fb-aa73-33fe-3ed5-f1d2b59ed7cb@huawei.com>
Date:   Tue, 1 Jun 2021 15:53:44 +0800
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A gentle ping :)

Thanks
Bixuan Cui

On 2021/5/18 11:31, Bixuan Cui wrote:
> There are unpaired calls in the msi:
> 
> msi_domain_alloc_irqs() {
>         ...
>         __irq_domain_alloc_irqs()
>         ...
>         irq_domain_activate_irq()
> }
> 
> msi_domain_free_irqs() {
>         ...
>         irq_domain_free_irqs()
> }
> 
> When msi_domain_alloc_irqs() and msi_domain_free_irqs() are called in
> pairs, the irq_domain_deactivate_irq() is missing calls.
> 
> This problem occurs during PCI initialization.After pci_msi_setup_msi_irqs
> is executed (invoke irq_domain_activate_irq to initialize the MSI irq),
> error_cleanup_irqs() of pcie_port_device_register() is executed.
> As follows:
> 
> pcie_port_device_register() {
> 	...
> 
> 	error_cleanup_irqs:
> 		pci_free_irq_vectors(dev);
> }
> 
> Invoking Procedure:
> 	pcie_port_device_register
> 	-> goto error_cleanup_irqs
> 	-> pci_free_irq_vectors(dev);
> 	    pci_disable_msi
> 	        free_msi_irqs
> 		    pci_msi_teardown_msi_irqs
> 		        msi_domain_free_irqs // no deactivate before free
> 			    irq_domain_free_irqs
> 
> Signed-off-by: Bixuan Cui <cuibixuan@huawei.com>
> ---
>  kernel/irq/msi.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
> index c41965e348b5..8828d4863c5d 100644
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -476,11 +476,6 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
>  	return 0;
>  
>  cleanup:
> -	for_each_msi_vector(desc, i, dev) {
> -		irq_data = irq_domain_get_irq_data(domain, i);
> -		if (irqd_is_activated(irq_data))
> -			irq_domain_deactivate_irq(irq_data);
> -	}
>  	msi_domain_free_irqs(domain, dev);
>  	return ret;
>  }
> @@ -506,6 +501,14 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
>  void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
>  {
>  	struct msi_desc *desc;
> +	struct irq_data *irq_data;
> +	int i;
> +
> +	for_each_msi_vector(desc, i, dev) {
> +		irq_data = irq_domain_get_irq_data(domain, i);
> +		if (irqd_is_activated(irq_data))
> +			irq_domain_deactivate_irq(irq_data);
> +	}
>  
>  	for_each_msi_entry(desc, dev) {
>  		/*
>