diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-12-13 19:27:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-13 09:24:05 +0100 |
| commit | 1fdd2859daca9819def080c87455e4ba377438af (patch) | |
| tree | 8b4bd0a3d2bfcf6a6d58c5d19f9f19619008ac7f /drivers/base | |
| parent | a38adf5a8ced455db3cf9f0f2cd835dae224dab9 (diff) | |
driver core: Add missing dev->bus->need_parent_lock checks
commit e121a833745b4708b660e3fe6776129c2956b041 upstream.
__device_release_driver() has to check dev->bus->need_parent_lock
before dropping the parent lock and acquiring it again as it may
attempt to drop a lock that hasn't been acquired or lock a device
that shouldn't be locked and create a lock imbalance.
Fixes: 8c97a46af04b (driver core: hold dev's parent lock when needed)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/dd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 169412ee4ae8..dbba123e058d 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -933,11 +933,11 @@ static void __device_release_driver(struct device *dev, struct device *parent) while (device_links_busy(dev)) { device_unlock(dev); - if (parent) + if (parent && dev->bus->need_parent_lock) device_unlock(parent); device_links_unbind_consumers(dev); - if (parent) + if (parent && dev->bus->need_parent_lock) device_lock(parent); device_lock(dev); |