netdev - Re: [PATCH ] cdc_ncm: fixes for big-endian architecture / MIPS

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Date:	Wed, 03 Aug 2011 03:42:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	alexey.orishko@...il.com
Cc:	netdev@...r.kernel.org, oliver@...kum.org,
	linux-usb@...r.kernel.org, gregkh@...e.de,
	alexey.orishko@...ricsson.com
Subject: Re: [PATCH ] cdc_ncm: fixes for big-endian architecture / MIPS

From: Alexey Orishko <alexey.orishko@...il.com>
Date: Tue,  2 Aug 2011 18:20:26 +0200

> @@ -203,8 +203,8 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
>  	req.bmRequestType = USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE;
>  	req.bNotificationType = USB_CDC_GET_NTB_PARAMETERS;
>  	req.wValue = 0;
> -	req.wIndex = cpu_to_le16(iface_no);
> -	req.wLength = cpu_to_le16(sizeof(ctx->ncm_parm));
> +	req.wIndex = iface_no;
> +	req.wLength = sizeof(ctx->ncm_parm);
>  
>  	err = cdc_ncm_do_request(ctx, &req, &ctx->ncm_parm, 0, NULL, 1000);
>  	if (err) {

This can't be correct.

"iface_no" is a u8 we read out of desc->bInterfaceNumber

we still have to extend it to a u16 and convert it to a little endian
16-bit value for the req.wIndex field.

If the types for the cdc notification struct are wrong, that's another
story entirely.  But currently they are marked as __le16 so you must
resolve this first.

Otherwise your changes will result in several new sparse endian
warnings.

I'm not applying this, even if it is correct functionally.

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