Re: [RFC 4/4] USB: cdc-acm: clean up handling of quirky devices

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On Mon, Sep 21, 2020 at 01:53:52PM +0200, Oliver Neukum wrote:
> Am Montag, den 21.09.2020, 13:35 +0200 schrieb Johan Hovold:
> > Instead of falling back to "combined-interface" probing when detecting
> > broken union and call-management descriptors, assume all interfaces with
> > three endpoints are of "combined-interface" type.
> 
> Hi,
> 
> this just ignores a union header. I am afraid that is not correct.
> Could you move it into the !union_header clause?

And probe for a combined interface before falling back to the management
descriptor then? Along the lines of

	if (!union_desc) {
		if (bNumEndpoints == 3) {
			goto probe_combined_interface;
		} else if (call_intf_num > 0) {
			data_intf_num = call_intf_num;
			...
		} else {
			return -ENODEV;
		}
	} else {
		...
	}
			
Johan



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