From: Saravana Kannan saravanak@google.com
commit 44e960490ddf868fc9135151c4a658936e771dc2 upstream.
Commit 21c27f06587d ("driver core: Fix SYNC_STATE_ONLY device link implementation") didn't completely fix STATELESS + SYNC_STATE_ONLY handling.
What looks like an optimization in that commit is actually a bug that causes an if condition to always take the else path. This prevents reordering of devices in the dpm_list when a DL_FLAG_STATELESS device link is create on top of an existing DL_FLAG_SYNC_STATE_ONLY device link.
Fixes: 21c27f06587d ("driver core: Fix SYNC_STATE_ONLY device link implementation") Signed-off-by: Saravana Kannan saravanak@google.com Cc: stable stable@vger.kernel.org Reviewed-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Link: https://lore.kernel.org/r/20200520043626.181820-1-saravanak@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -360,12 +360,14 @@ struct device_link *device_link_add(stru
if (flags & DL_FLAG_STATELESS) { kref_get(&link->kref); - link->flags |= DL_FLAG_STATELESS; if (link->flags & DL_FLAG_SYNC_STATE_ONLY && - !(link->flags & DL_FLAG_STATELESS)) + !(link->flags & DL_FLAG_STATELESS)) { + link->flags |= DL_FLAG_STATELESS; goto reorder; - else + } else { + link->flags |= DL_FLAG_STATELESS; goto out; + } }
/*