Re: [PATCH v7 4/8] hw/usb/redirect-server: Announce the exported device

[Junjie Cao <junjie.cao@linux.dev>]

Hi Jamin,

On Wed, Oct 28, 2026 at 03:41:45AM +0000, Jamin Lin wrote:
> +    /* The parser calls these directly, so they must not be NULL. */
> +    s->parser->filter_reject_func = usbredir_server_filter_reject;

start_iso_stream_func, stop_iso_stream_func and iso_packet_func are
still NULL at the end of the series, and the parser accepts those
messages without any capability.

I exported usb-audio to a client QEMU (qemu-xhci, Debian guest) and ran
aplay there. Once the guest picks the streaming alt setting, ep_info
lists the isochronous endpoint, redirect.c sends start_iso_stream, and
the exporting QEMU segfaults on a NULL call in usbredirparser_do_read().

Could the server install these and refuse the stream until it supports
isochronous transfers?

Thanks,
Junjie