[U-Boot] [PATCH v2 1/2] usb: ehci: exynos: Fix multiple FDT decode

[Simon Glass]

Hi,

On Tue, Feb 12, 2013 at 10:26 PM, Vivek Gautam <gautam.vivek at samsung.com> wrote:
> With current FDT support driver tries to parse device node
> twice in ehci_hcd_init() and ehci_hcd_stop(), which shouldn't
> happen ideally.
> Making provision to store data in a global structure and thereby
> passing its pointer when needed.
>
> Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>

Nice patch.

> ---
>
> This patch comes up as a fix for earlier problem of multiple FDT
> decode. Actually no 'v1' present for this patch.
>
>  drivers/usb/host/ehci-exynos.c |   40 +++++++++++-----------------------------
>  1 files changed, 11 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index 3ca4c5c..68f12fc 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -42,9 +42,11 @@ DECLARE_GLOBAL_DATA_PTR;
>   */
>  struct exynos_ehci {
>         struct exynos_usb_phy *usb;
> -       unsigned int *hcd;
> +       unsigned int hcd;

I think this should be a pointer. Perhaps a (struct ehci_hccr *?

>  };
>
> +static struct exynos_ehci exynos;
> +
>  static int exynos_usb_parse_dt(const void *blob, struct exynos_ehci *exynos)
>  {
>         unsigned int node;
> @@ -59,8 +61,8 @@ static int exynos_usb_parse_dt(const void *blob, struct exynos_ehci *exynos)
>         /*
>          * Get the base address for EHCI controller from the device node
>          */
> -       exynos->hcd = (unsigned int *)fdtdec_get_addr(blob, node, "reg");
> -       if (exynos->hcd == NULL) {
> +       exynos->hcd = fdtdec_get_addr(blob, node, "reg");
> +       if (exynos->hcd < 0) {

You need to check for FDT_ADDR_NONE here.

>                 debug("Can't get the EHCI register address\n");
>                 return -ENXIO;
>         }
> @@ -144,20 +146,13 @@ static void reset_usb_phy(struct exynos_usb_phy *usb)
>   */
>  int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
>  {
> -       struct exynos_ehci *exynos = NULL;
> -
> -       exynos = (struct exynos_ehci *)
> -                       kzalloc(sizeof(struct exynos_ehci), GFP_KERNEL);
> -       if (!exynos) {
> -               debug("failed to allocate exynos ehci context\n");
> -               return -ENOMEM;
> -       }
> +       struct exynos_ehci *ctx = &exynos;
>
> -       exynos_usb_parse_dt(gd->fdt_blob, exynos);
> +       exynos_usb_parse_dt(gd->fdt_blob, ctx);
>
> -       setup_usb_phy(exynos->usb);
> +       setup_usb_phy(ctx->usb);
>
> -       *hccr = (struct ehci_hccr *)(exynos->hcd);
> +       *hccr = (struct ehci_hccr *)(ctx->hcd);
>         *hcor = (struct ehci_hcor *)((uint32_t) *hccr
>                                 + HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
>
> @@ -165,8 +160,6 @@ int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
>                 (uint32_t)*hccr, (uint32_t)*hcor,
>                 (uint32_t)HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
>
> -       kfree(exynos);
> -
>         return 0;
>  }
>
> @@ -176,20 +169,9 @@ int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
>   */
>  int ehci_hcd_stop(int index)
>  {
> -       struct exynos_ehci *exynos = NULL;
> -
> -       exynos = (struct exynos_ehci *)
> -                       kzalloc(sizeof(struct exynos_ehci), GFP_KERNEL);
> -       if (!exynos) {
> -               debug("failed to allocate exynos ehci context\n");
> -               return -ENOMEM;
> -       }
> -
> -       exynos_usb_parse_dt(gd->fdt_blob, exynos);
> -
> -       reset_usb_phy(exynos->usb);
> +       struct exynos_ehci *ctx = &exynos;
>
> -       kfree(exynos);
> +       reset_usb_phy(ctx->usb);
>
>         return 0;
>  }
> --
> 1.7.6.5
>

Regards,
Simon