PM: runtime: Resume the device earlier in __device_release_driver()
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>
Thu, 22 Oct 2020 15:38:22 +0000 (17:38 +0200)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Mon, 2 Nov 2020 17:14:07 +0000 (18:14 +0100)
commit9226c504e364158a17a68ff1fe9d67d266922f50
treeaa9065e2b60f6e533dc6f012aaf34a3791b86bb1
parentd6e36668598154820177bfd78c1621d8e6c580a2
PM: runtime: Resume the device earlier in __device_release_driver()

Since the device is resumed from runtime-suspend in
__device_release_driver() anyway, it is better to do that before
looking for busy managed device links from it to consumers, because
if there are any, device_links_unbind_consumers() will be called
and it will cause the consumer devices' drivers to unbind, so the
consumer devices will be runtime-resumed.  In turn, resuming each
consumer device will cause the supplier to be resumed and when the
runtime PM references from the given consumer to it are dropped, it
may be suspended.  Then, the runtime-resume of the next consumer
will cause the supplier to resume again and so on.

Update the code accordingly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Fixes: 9ed9895370ae ("driver core: Functional dependencies tracking support")
Cc: All applicable <stable@vger.kernel.org> # All applicable
Tested-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/base/dd.c