Re: [PATCH 1/4] PCI: introduce helper functions for device flag operation

Alex Williamson
2014-07-28T21:00:06Z

On Wed, 2014-07-23 at 00:19 +0800, Ethan Zhao wrote:
> This patch introduced three helper functions to hide direct
> device flag operation.
>
> void pci_set_dev_assigned(struct pci_dev *pdev);
> void pci_set_dev_deassigned(struct pci_dev *pdev);
> bool pci_is_dev_assigned(struct pci_dev *pdev);
>
> Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
> ---
> include/linux/pci.h | 13 +++++++++++++
> 1 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index aab57b4..5f6f8fa 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1129,6 +1129,19 @@ resource_size_t pcibios_window_alignment(struct pci_bus *bus,
>
> int pci_set_vga_state(struct pci_dev *pdev, bool decode,
> unsigned int command_bits, u32 flags);
> +/* helper functions for operation of device flag */
> +static inline void pci_set_dev_assigned(struct pci_dev *pdev)
> +{
> + pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> +}
> +static inline void pci_set_dev_deassigned(struct pci_dev *pdev)
> +{
> + pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> +}

I think pci_clear_dev_assigned() would make more sense, we're not
setting a flag named DEASSIGNED.

> +static inline bool pci_is_dev_assigned(struct pci_dev *pdev)
> +{
> + return pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED ? true : false;
> +}

The ternary operation isn't necessary. Thanks,

Alex

> /* kmem_cache style wrapper around pci_alloc_consistent() */
>
> #include <linux/pci-dma.h>