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BACKPORT: driver core: Skip unnecessary work when device doesn't have sync_state()

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A bunch of busy work is done for devices that don't have sync_state()
support. Stop doing the busy work.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200221080510.197337-4-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 77036165d8bcf7c7b2a2df28a601ec2c52bb172d)
Bug: 151865289
Change-Id: Id513185be93c036150ffd7156104f898fec70c11
(cherry picked from commit a27d26af7d122f04734a31e16aefbc56de68ae29)
Bug: 265875490
This commit is contained in:
Saravana Kannan
2020-02-21 00:05:10 -08:00
committed by Alistair Delva
parent 70227f90ff
commit 2956c20bea
1 changed files with 3 additions and 1 deletions
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4
drivers/base/core.c
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@@ -736,6 +736,8 @@ static void __device_links_queue_sync_state(struct device *dev,
{
struct device_link *link;
if (!dev_has_sync_state(dev))
return;
if (dev->state_synced)
return;
@@ -837,7 +839,7 @@ late_initcall(sync_state_resume_initcall);
static void __device_links_supplier_defer_sync(struct device *sup)
{
if (list_empty(&sup->links.defer_sync))
if (list_empty(&sup->links.defer_sync) && dev_has_sync_state(sup))
list_add_tail(&sup->links.defer_sync, &deferred_sync);
}