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driver core: Do not call rpm_put_suppliers() in pm_runtime_drop_link()

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[ Upstream commit a1fdbfbb1d ]

Calling rpm_put_suppliers() from pm_runtime_drop_link() is excessive
as it affects all suppliers of the consumer device and not just the
one pointed to by the device link being dropped.  Worst case it may
cause the consumer device to stop working unexpectedly.  Moreover, in
principle it is racy with respect to runtime PM of the consumer
device.

To avoid these problems drop runtime PM references on the particular
supplier pointed to by the link in question only and do that after
the link has been dropped from the consumer device's list of links to
suppliers, which is in device_link_free().

Fixes: a0504aecba ("PM / runtime: Drop usage count for suppliers at device link removal")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafael J. Wysocki 2019-02-01 01:52:45 +01:00 committed by Greg Kroah-Hartman
parent d6a91833c6
commit 02f6982774
2 changed files with 3 additions and 2 deletions
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3
drivers/base/core.c
View File

@ -357,6 +357,9 @@ EXPORT_SYMBOL_GPL(device_link_add);
static void device_link_free(struct device_link *link)
{
while (refcount_dec_not_one(&link->rpm_active))
pm_runtime_put(link->supplier);
put_device(link->consumer);
put_device(link->supplier);
kfree(link);

2
drivers/base/power/runtime.c
View File

@ -1603,8 +1603,6 @@ void pm_runtime_new_link(struct device *dev)
void pm_runtime_drop_link(struct device *dev)
{
rpm_put_suppliers(dev);
spin_lock_irq(&dev->power.lock);
WARN_ON(dev->power.links_count == 0);
dev->power.links_count--;