linux-kernel - Re: [PATCH v2] PCI: endpoint: Set endpoint controller pointer to null

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Message-ID: <20190611100742.GA29976@redmoon>
Date:   Tue, 11 Jun 2019 11:07:42 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Alan Mikhak <alan.mikhak@...ive.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kishon@...com, linux-riscv@...ts.infradead.org, palmer@...ive.com,
        paul.walmsley@...ive.com
Subject: Re: [PATCH v2] PCI: endpoint: Set endpoint controller pointer to null

On Thu, May 23, 2019 at 02:45:44PM -0700, Alan Mikhak wrote:
> Set endpoint controller pointer to null in pci_epc_remove_epf()
> to avoid -EBUSY on subsequent call to pci_epc_add_epf().
> 
> Requires checking for null endpoint function pointer.
> 
> Signed-off-by: Alan Mikhak <alan.mikhak@...ive.com>
> ---
>  drivers/pci/endpoint/pci-epc-core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied to pci/endpoint for v5.3, thanks.

Lorenzo

> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index e4712a0f249c..2091508c1620 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -519,11 +519,12 @@ void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf)
>  {
>  	unsigned long flags;
>  
> -	if (!epc || IS_ERR(epc))
> +	if (!epc || IS_ERR(epc) || !epf)
>  		return;
>  
>  	spin_lock_irqsave(&epc->lock, flags);
>  	list_del(&epf->list);
> +	epf->epc = NULL;
>  	spin_unlock_irqrestore(&epc->lock, flags);
>  }
>  EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
> -- 
> 2.7.4
>