[PATCH] pci: aspm: make pcie_capability a packed struct type

[Keng-Yu Lin]

On Fri, Dec 7, 2012 at 8:02 AM, Colin King <colin.king at canonical.com> wrote:
> From: Colin Ian King <colin.king at canonical.com>
>
> Since we are mapping the pcie_capabiliy struct 1-to-1 onto real
> data we should give it a packed attribute to ensure GCC does not
> stuff in extra padding.
>
> I took the liberty of making this a typedef to make it a little
> simpler than having packed structs everywhere.
>
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
> ---
>  src/pci/aspm/aspm.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/src/pci/aspm/aspm.c b/src/pci/aspm/aspm.c
> index e6d91ca..1a6cc27 100644
> --- a/src/pci/aspm/aspm.c
> +++ b/src/pci/aspm/aspm.c
> @@ -61,7 +61,7 @@ struct pci_device {
>  /* PCI Express Capability Structure is defined in Section 7.8
>   * of PCI Express®i Base Specification Revision 2.0
>   */
> -struct pcie_capability {
> +typedef struct {
>         uint8_t pcie_cap_id;
>         uint8_t next_cap_point;
>         uint16_t pcie_cap_reg;
> @@ -86,7 +86,7 @@ struct pcie_capability {
>         uint32_t slot_cap2;
>         uint16_t slot_contrl2;
>         uint16_t slot_status2;
> -};
> +} __attribute__ ((packed)) pcie_capability;
>
>  static int facp_get_aspm_control(fwts_framework *fw, int *aspm)
>  {
> @@ -118,28 +118,28 @@ static int pcie_compare_rp_dev_aspm_registers(fwts_framework *fw,
>         struct pci_device *rp,
>         struct pci_device *dev)
>  {
> -       struct pcie_capability *rp_cap, *device_cap;
> +       pcie_capability *rp_cap, *device_cap;
>         uint8_t rp_aspm_cntrl, device_aspm_cntrl;
>         uint8_t next_cap;
>         int ret = FWTS_OK;
>         bool l0s_disabled = false, l1_disabled = false;
>
>         next_cap = rp->config[FWTS_PCI_CAPABILITIES_POINTER];
> -       rp_cap = (struct pcie_capability *) &rp->config[next_cap];
> +       rp_cap = (pcie_capability *) &rp->config[next_cap];
>         while (rp_cap->pcie_cap_id != FWTS_PCI_EXPRESS_CAP_ID) {
>                 if (rp_cap->next_cap_point == FWTS_PCI_LAST_ID)
>                         break;
>                 next_cap = rp_cap->next_cap_point;
> -               rp_cap = (struct pcie_capability *) &rp->config[next_cap];
> +               rp_cap = (pcie_capability *) &rp->config[next_cap];
>         }
>
>         next_cap = dev->config[FWTS_PCI_CAPABILITIES_POINTER];
> -       device_cap = (struct pcie_capability *) &dev->config[next_cap];
> +       device_cap = (pcie_capability *)&dev->config[next_cap];
>         while (device_cap->pcie_cap_id != FWTS_PCI_EXPRESS_CAP_ID) {
>                 if (device_cap->next_cap_point == FWTS_PCI_LAST_ID)
>                         break;
>                 next_cap = device_cap->next_cap_point;
> -               device_cap = (struct pcie_capability *) &dev->config[next_cap];
> +               device_cap = (pcie_capability *)&dev->config[next_cap];
>         }
>
>
> --
> 1.8.0
>
Acked-by: Keng-Yu Lin <kengyu at canonical.com>