linux-kernel - Re: [PATCH v4 2/3] PCI: endpoint: Fix error handling in pci_epc_epf

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Date:   Thu, 14 Dec 2017 16:37:22 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Niklas Cassel <niklass@...s.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] PCI: endpoint: Fix error handling in
 pci_epc_epf_link()

Hi Niklas,

On Tuesday 12 December 2017 07:46 PM, Niklas Cassel wrote:
> The error handling in pci_epc_epf_link() is broken,
> since the clean up code for pci_epc_add_epf() calls clear_bit(),
> even though the matching set_bit() is done after pci_epc_add_epf().
> 
> Also, clear_bit() should be done before pci_epc_remove_epf(),
> since clean up code should normally do things in the reverse order.
> 
> Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions")
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> ---
>  drivers/pci/endpoint/pci-ep-cfs.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
> index 4f74386c1ced..e1f5adc9e113 100644
> --- a/drivers/pci/endpoint/pci-ep-cfs.c
> +++ b/drivers/pci/endpoint/pci-ep-cfs.c
> @@ -106,7 +106,7 @@ static int pci_epc_epf_link(struct config_item *epc_item,
>  	epf = epf_group->epf;
>  	ret = pci_epc_add_epf(epc, epf);
>  	if (ret)
> -		goto err_add_epf;
> +		return ret;

Actually the func_no should be populated before invoking pci_epc_add_epf. Once
that is done, the error handling should be fine.

Thanks
Kishon