[U-Boot] [PATCH v2] usb: Use well-known descriptor sizes when parsing configuration

[Julius Werner]

> How would that make the code more consistent ? It seems if the device can not
> even provide valid config ep descriptor, the device is broken beyond salvation.

Okay, sure, it's not important enough to argue about. Will resubmit it this way.

>> The sizeof() thing is true for the configuration descriptor, but not
>> for some others (e.g. endpoint) because U-Boot reserves fields for
>> it's own stuff behind that.
>
> Urgh, then the structure defining the descriptor shall be separated out.

Yes, maybe. But let's please not blow this patch up any more than it already is.

>> > Would be nice to clean this up into "understandable" format by defining a
>> > variable for the &buffer[index] and than just simply comparing this var-
>> >
>> >>bInterfaceNumber and curr_if_num .
>>
>> Agreed, but let's clean this up one patch at a time.
>
> Would you do a series on this maybe?

On second thought, we already have the variable head (respectively
head->bLength) to point there... I can just use that instead.

> So, let's just ignore broken descriptors.

Done.

> Document this properly then.

I'm already adding a comment to usb_parse_config() to point that
out... I'll clarify that this includes sanitization in addition to
byte swapping.