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PM: runtime: Fix ordering in pm_runtime_get_suppliers()

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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: 4c06c4e6cf ("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>
This commit is contained in:
Adrian Hunter 2021-03-26 12:56:18 +02:00 • committed by Greg Kroah-Hartman
commit 07b19a118d
1 changed files with 1 additions and 1 deletions
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2
drivers/base/power/runtime.c
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@ -1663,8 +1663,8 @@ void pm_runtime_get_suppliers(struct device *dev)
device_links_read_lock_held())
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);