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PM: runtime: Drop runtime PM references to supplier on link removal

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While removing a device link, drop the supplier device's runtime PM
usage counter as many times as needed to drop all of the runtime PM
references to it from the consumer in addition to dropping the
consumer's link count.

Fixes: baa8809f60 ("PM / runtime: Optimize the use of device links")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Tested-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki
2020-10-21 21:12:15 +02:00
parent 3cea11cd5e
commit e0e398e204
3 changed files with 24 additions and 7 deletions
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6
drivers/base/core.c
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@@ -773,8 +773,7 @@ static void __device_link_del(struct kref *kref)
dev_dbg(link->consumer, "Dropping the link to %s\n",
dev_name(link->supplier));
if (link->flags & DL_FLAG_PM_RUNTIME)
pm_runtime_drop_link(link->consumer);
pm_runtime_drop_link(link);
list_del_rcu(&link->s_node);
list_del_rcu(&link->c_node);
@@ -788,8 +787,7 @@ static void __device_link_del(struct kref *kref)
dev_info(link->consumer, "Dropping the link to %s\n",
dev_name(link->supplier));
if (link->flags & DL_FLAG_PM_RUNTIME)
pm_runtime_drop_link(link->consumer);
pm_runtime_drop_link(link);
list_del(&link->s_node);
list_del(&link->c_node);