linux-kernel - Re: [PATCH v3 2/3] PCI: endpoint: Fix error handling in pci_epc_epf

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Date:   Mon, 27 Nov 2017 16:16:23 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Niklas Cassel <niklas.cassel@...s.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Niklas Cassel <niklass@...s.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] PCI: endpoint: Fix error handling in
 pci_epc_epf_link()

On Mon, Nov 27, 2017 at 04:49:54PM +0100, Niklas Cassel wrote:
> The error handling in pci_epc_epf_link() was broken,

s/was/is

(ie commit logs should be written in the present tense)

> since the clean up code for pci_epc_add_epf() did clear_bit(),

s/did/calls (see above)

> 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>
> ---
>  drivers/pci/endpoint/pci-ep-cfs.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>

> 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;
>  
>  	func_no = find_first_zero_bit(&epc_group->function_num_map,
>  				      sizeof(epc_group->function_num_map));
> @@ -120,10 +120,8 @@ static int pci_epc_epf_link(struct config_item *epc_item,
>  	return 0;
>  
>  err_epf_bind:
> -	pci_epc_remove_epf(epc, epf);
> -
> -err_add_epf:
>  	clear_bit(func_no, &epc_group->function_num_map);
> +	pci_epc_remove_epf(epc, epf);
>  
>  	return ret;
>  }
> -- 
> 2.14.2
>