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q-dev: avoid zombie USB device #55

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q-dev: avoid zombie USB device #55

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2c3d8a8
q-dev: avoid zombie device
piotrbartman Apr 2, 2026
74a059a
q-dev: add usb-reset
piotrbartman May 27, 2026
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19 changes: 19 additions & 0 deletions qubes-rpc/qubes.USBDetach
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,25 @@ if [ -z "$busid" ]; then
usbip_sockfd="/sys/bus/usb/devices/$busid/usbip_sockfd"
if [ -w "$usbip_sockfd" ]; then
echo -1 > "$usbip_sockfd"

# avoid zombie usb (visible from backend but held by usbip driver)
# disconnect usbip driver
if ! echo "$busid" > "/sys/bus/usb/drivers/usbip-host/unbind" 2>/dev/null; then
echo "Failed to unbind USB device $busid from usbip-host driver" >&2
exit 1
fi

# reset
if ! /usr/lib/qubes/usb-reset "/sys/bus/usb/devices/$busid"; then
echo "Failed to reset USB device $busid" >&2
exit 1
fi

# reload driver to make it fully available in backend again
if ! echo "$busid" > "/sys/bus/usb/drivers_probe"; then
echo "Failed to reload USB device $busid driver" >&2
exit 1
fi
else
echo "Device $busid not found or not attached to any VM!" >&2
exit 1
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