Since __device_release_driver() is called with the device lock held
and since the same device lock is obtained by the functions that
perform asynchronous probing (driver_attach_async() and
__device_attach_async_helper()), asynchronous probing is already
serialized against __device_release_driver(). Remove the
async_synchronize_full() call from __device_release_driver() to
avoid that a deadlock is triggered.
See also commit 765230b5f084 ("driver-core: add asynchronous probing
support for drivers").
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Lee Duncan <lduncan@xxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Luis R. Rodriguez <mcgrof@xxxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/dd.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index edfc9f0b1180..d6520de659bd 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -926,9 +926,6 @@ static void __device_release_driver(struct device *dev, struct device *parent)
drv = dev->driver;
if (drv) {
- if (driver_allows_async_probing(drv))
- async_synchronize_full();
-
while (device_links_busy(dev)) {
device_unlock(dev);
if (parent)
--
2.19.0.605.g01d371f741-goog
