linux-kernel - Re: [PATCH] PCI: Update pci_find_capability() stub return values

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Date: Wed, 27 Mar 2024 14:49:34 -0700
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: Update pci_find_capability() stub return values


On 3/27/24 11:02 AM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> f646c2a0a668 ("PCI: Return u8 from pci_find_capability() and similar") and
> ee8b1c478a9f ("PCI: Return u16 from pci_find_ext_capability() and similar")
> updated the return type of the extern declarations, but neglected to update
> the type of the stubs used CONFIG_PCI is not enabled.
>
> Update them to match the extern declarations.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---

This change looks fine to me.

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

But the callers of these functions still seems to use int declaration to store
the output. Any reason for not changing them? Like the usages in
drivers/pci/pci.c?

>  include/linux/pci.h | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index b19992a5dfaf..6a09bd9636d5 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -2011,10 +2011,9 @@ static inline int pci_register_driver(struct pci_driver *drv)
>  static inline void pci_unregister_driver(struct pci_driver *drv) { }
>  static inline u8 pci_find_capability(struct pci_dev *dev, int cap)
>  { return 0; }
> -static inline int pci_find_next_capability(struct pci_dev *dev, u8 post,
> -					   int cap)
> +static inline u8 pci_find_next_capability(struct pci_dev *dev, u8 post, int cap)
>  { return 0; }
> -static inline int pci_find_ext_capability(struct pci_dev *dev, int cap)
> +static inline u16 pci_find_ext_capability(struct pci_dev *dev, int cap)
>  { return 0; }
>  
>  static inline u64 pci_get_dsn(struct pci_dev *dev)

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer