[U-Boot] [PATCH V3 07/20] usb: gadget: config: fix unaligned access issues

Marek Vasut
2013-08-02T10:57:30Z

Dear Troy Kisky,

I don't understand what this patch does and why. It's not very clear from the
(missing) commit message either.

> Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
> ---
> drivers/usb/gadget/config.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
> index f563afe..014a679 100644
> --- a/drivers/usb/gadget/config.c
> +++ b/drivers/usb/gadget/config.c
> @@ -10,6 +10,7 @@
> */
>
> #include <common.h>
> +#include <asm/unaligned.h>
> #include <asm/errno.h>
> #include <linux/list.h>
> #include <linux/string.h>
> @@ -86,7 +87,8 @@ int usb_gadget_config_buf(
> /* config descriptor first */
> if (length < USB_DT_CONFIG_SIZE || !desc)
> return -EINVAL;
> - *cp = *config;
> + /* config need not be aligned */
> + memcpy(cp, config, sizeof(*cp));
>
> /* then interface/endpoint/class/vendor/... */
> len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (u8 *)buf,
> @@ -100,7 +102,7 @@ int usb_gadget_config_buf(
> /* patch up the config descriptor */
> cp->bLength = USB_DT_CONFIG_SIZE;
> cp->bDescriptorType = USB_DT_CONFIG;
> - cp->wTotalLength = cpu_to_le16(len);
> + put_unaligned_le16(len, &cp->wTotalLength);
> cp->bmAttributes |= USB_CONFIG_ATT_ONE;
> return len;
> }

Best regards,
Marek Vasut