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| author |   Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-24 10:33:36 +0200 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-05-27 12:18:55 +0200 |
| commit | a0504aecba76baa1cddbc23512eb8be14df74cef (patch) | |
| tree | e77b3dd0c67e21445e6cf94ee6cd2899451772cf /drivers/base | |
| parent | PM / runtime: Fixup reference counting of device link suppliers at probe (diff) | |
| download | linux-dev-a0504aecba76baa1cddbc23512eb8be14df74cef.tar.xz linux-dev-a0504aecba76baa1cddbc23512eb8be14df74cef.zip | |
PM / runtime: Drop usage count for suppliers at device link removal
In the case consumer device is runtime resumed, while the link to the
supplier is removed, the earlier call to pm_runtime_get_sync() made from
rpm_get_suppliers() does not get properly balanced with a corresponding
call to pm_runtime_put(). This leads to that suppliers remains to be
runtime resumed forever, while they don't need to.
Let's fix the behaviour by calling rpm_put_suppliers() when dropping a
device link. Not that, since rpm_put_suppliers() checks the
link->rpm_active flag, we can correctly avoid to call pm_runtime_put() in
cases when we shouldn't.
Reported-by: Todor Tomov <todor.tomov@linaro.org>
Fixes: 21d5c57b3726 (PM / runtime: Use device links)
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/runtime.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 6f4f50e196c1..c6030f100c08 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1586,6 +1586,8 @@ 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--; |