Author: hselasky Date: Fri Jan 18 08:49:10 2019 New Revision: 343136 URL: https://svnweb.freebsd.org/changeset/base/343136
Log: MFC r342778: Reduce timeout for reading the USB HUB port status to 1000ms and try to filter out dead USB HUB devices by implementing an error counter, so that the USB enumeration thread does not spend all its time reading from non-responding devices, blocking user-space access in the end. Tested by: Matthias Apitz <g...@unixarea.de> Sponsored by: Mellanox Technologies Modified: stable/10/sys/dev/usb/usb_hub.c stable/10/sys/dev/usb/usb_request.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/usb/usb_hub.c ============================================================================== --- stable/10/sys/dev/usb/usb_hub.c Fri Jan 18 08:48:30 2019 (r343135) +++ stable/10/sys/dev/usb/usb_hub.c Fri Jan 18 08:49:10 2019 (r343136) @@ -130,6 +130,8 @@ struct uhub_softc { int sc_disable_enumeration; int sc_disable_port_power; #endif + uint8_t sc_usb_port_errors; /* error counter */ +#define UHUB_USB_PORT_ERRORS_MAX 4 uint8_t sc_flags; #define UHUB_FLAG_DID_EXPLORE 0x01 }; @@ -588,13 +590,25 @@ uhub_read_port_status(struct uhub_softc *sc, uint8_t p struct usb_port_status ps; usb_error_t err; + if (sc->sc_usb_port_errors >= UHUB_USB_PORT_ERRORS_MAX) { + DPRINTFN(4, "port %d, HUB looks dead, too many errors\n", portno); + sc->sc_st.port_status = 0; + sc->sc_st.port_change = 0; + return (USB_ERR_TIMEOUT); + } + err = usbd_req_get_port_status( sc->sc_udev, NULL, &ps, portno); - /* update status regardless of error */ - - sc->sc_st.port_status = UGETW(ps.wPortStatus); - sc->sc_st.port_change = UGETW(ps.wPortChange); + if (err == 0) { + sc->sc_st.port_status = UGETW(ps.wPortStatus); + sc->sc_st.port_change = UGETW(ps.wPortChange); + sc->sc_usb_port_errors = 0; + } else { + sc->sc_st.port_status = 0; + sc->sc_st.port_change = 0; + sc->sc_usb_port_errors++; + } /* debugging print */ Modified: stable/10/sys/dev/usb/usb_request.c ============================================================================== --- stable/10/sys/dev/usb/usb_request.c Fri Jan 18 08:48:30 2019 (r343135) +++ stable/10/sys/dev/usb/usb_request.c Fri Jan 18 08:49:10 2019 (r343136) @@ -1595,8 +1595,9 @@ usbd_req_get_port_status(struct usb_device *udev, stru USETW(req.wValue, 0); req.wIndex[0] = port; req.wIndex[1] = 0; - USETW(req.wLength, sizeof *ps); - return (usbd_do_request(udev, mtx, &req, ps)); + USETW(req.wLength, sizeof(*ps)); + + return (usbd_do_request_flags(udev, mtx, &req, ps, 0, NULL, 1000)); } /*------------------------------------------------------------------------* _______________________________________________ svn-src-stable-10@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-stable-10 To unsubscribe, send any mail to "svn-src-stable-10-unsubscr...@freebsd.org"