On forced unbind the parent lock is taken, as the device might be a USB device. The device to be unbound might have active consumers, which must be unbound before calling device_release_driver(), otherwise this function might deadlock when trying to take the parent lock during consumer unbind.
Signed-off-by: Lucas Stach <[email protected]> --- drivers/base/bus.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 6470eb8088f4..23df171a6a64 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -186,6 +186,9 @@ static ssize_t unbind_store(struct device_driver *drv, const char *buf, dev = bus_find_device_by_name(bus, NULL, buf); if (dev && dev->driver == drv) { + while (device_links_busy(dev)) { + device_links_unbind_consumers(dev); + } if (dev->parent) /* Needed for USB */ device_lock(dev->parent); device_release_driver(dev); -- 2.11.0
