| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 33/56] PM: runtime: Fix ordering in pm_runtime_get_suppliers() | Date | Mon, 5 Apr 2021 10:54:04 +0200 |
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From: Adrian Hunter <adrian.hunter@intel.com>
commit c0c33442f7203704aef345647e14c2fb86071001 upstream.
rpm_active indicates how many times the supplier usage_count has been incremented. Consequently it must be updated after pm_runtime_get_sync() of the supplier, not before.
Fixes: 4c06c4e6cf63 ("driver core: Fix possible supplier PM-usage counter imbalance") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: 5.1+ <stable@vger.kernel.org> # 5.1+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/base/power/runtime.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1572,8 +1572,8 @@ void pm_runtime_get_suppliers(struct dev list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) if (link->flags & DL_FLAG_PM_RUNTIME) { link->supplier_preactivated = true; - refcount_inc(&link->rpm_active); pm_runtime_get_sync(link->supplier); + refcount_inc(&link->rpm_active); } device_links_read_unlock(idx);
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