AIO rework for extended worker threads#58
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sys/dev/usb/xhci.c: revision 1.191 sys/dev/usb/usb_subr.c: revision 1.280 sys/dev/usb/usb_subr.c: revision 1.281 sys/dev/usb/usbdivar.h: revision 1.140 usb(9): Record config index, not just number, in struct usbd_device. The index is a zero-based index in [0, bNumConfigurations), or -1 for unconfigured. The number is an arbitrary value of a config descriptor's bConfigurationValue field, or 0 for unconfigured -- with the tricky caveat that bConfigurationValue might also be 0. Preparation for fixing: PR kern/59185: panic over KASSERTMSG(dev->ud_ifaces == NULL) on Dell Latitude 7490 PR kern/59624: Booting NetBSD-11 from USB on my Dell machine panics and hangs PR kern/57447: HEAD fails to probe USB devices and fails to boot up usb(9): Use ud_configidx, not ud_config, to see if unconfigured. ud_config is a device-provided quantity in the config descriptor's bConfigurationValue, and a faulty (or malicious) device can provide 0 for that value, which coincides with our software sentinel value USBD_UNCONFIG_NO of 0. Instead of testing ud_config, test ud_configidx, which is an index in [0, bNumConfigurations) or -1, for which the device cannot confuse us by a value that coincides with the sentinel -1. PR kern/59185: panic over KASSERTMSG(dev->ud_ifaces == NULL) on Dell Latitude 7490 PR kern/59624: Booting NetBSD-11 from USB on my Dell machine panics and hangs PR kern/57447: HEAD fails to probe USB devices and fails to boot up
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