Hi reviewers,
I suggest to backport
commit "887371066039011144b4a94af97d9328df6869a2 PM: runtime: Fix supplier device management during consumer probe"
to linux-5.15 tree.
This patch fix device link of runtime pm issue.
commit: 887371066039011144b4a94af97d9328df6869a2
subject: PM: runtime: Fix supplier device management during consumer probe
Thanks.
BR
Peter
-----Original Message-----
From: gregkh@xxxxxxxxxxxxxxxxxxx <gregkh@xxxxxxxxxxxxxxxxxxx>
Sent: Saturday, July 9, 2022 4:22 PM
To: rafael.j.wysocki@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; Peter Wang (王信友) <peter.wang@xxxxxxxxxxxx>; stable@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Subject: FAILED: patch "[PATCH] PM: runtime: Fix supplier device management during consumer" failed to apply to 5.15-stable tree
The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 887371066039011144b4a94af97d9328df6869a2 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Date: Thu, 30 Jun 2022 21:16:41 +0200
Subject: [PATCH] PM: runtime: Fix supplier device management during consumer probe
Because pm_runtime_get_suppliers() bumps up the rpm_active counter of each device link to a supplier of the given device in addition to bumping up the supplier's PM-runtime usage counter, a runtime suspend of the consumer device may case the latter to go down to 0 when pm_runtime_put_suppliers() is running on a remote CPU. If that happens after pm_runtime_put_suppliers() has released power.lock for the consumer device, and a runtime resume of that device takes place immediately after it, before pm_runtime_put() is called for the supplier, that pm_runtime_put() call may cause the supplier to be suspended even though the consumer is active.
To prevent that from happening, modify pm_runtime_get_suppliers() to call pm_runtime_get_sync() for the given device's suppliers without touching the rpm_active counters of the involved device links Accordingly, modify pm_runtime_put_suppliers() to call pm_runtime_put() for the given device's suppliers without looking at the rpm_active counters of the device links at hand. [This is analogous to what happened before commit 4c06c4e6cf63 ("driver core: Fix possible supplier PM-usage counter imbalance").]
Since pm_runtime_get_suppliers() sets supplier_preactivated for each device link where the supplier's PM-runtime usage counter has been incremented and pm_runtime_put_suppliers() calls pm_runtime_put() for the suppliers whose device links have supplier_preactivated set, the PM-runtime usage counter is balanced for each supplier and this is independent of the runtime suspend and resume of the consumer device.
However, in case a device link with DL_FLAG_PM_RUNTIME set is dropped during the consumer device probe, so pm_runtime_get_suppliers() bumps up the supplier's PM-runtime usage counter, but it cannot be dropped by pm_runtime_put_suppliers(), make device_link_release_fn() take care of that.
Fixes: 4c06c4e6cf63 ("driver core: Fix possible supplier PM-usage counter imbalance")
Reported-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
Cc: 5.1+ <stable@xxxxxxxxxxxxxxx> # 5.1+
diff --git a/drivers/base/core.c b/drivers/base/core.c index 58aa49527d3a..460d6f163e41 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -487,6 +487,16 @@ static void device_link_release_fn(struct work_struct *work)
device_link_synchronize_removal();
pm_runtime_release_supplier(link);
+ /*
+ * If supplier_preactivated is set, the link has been dropped between
+ * the pm_runtime_get_suppliers() and pm_runtime_put_suppliers() calls
+ * in __driver_probe_device(). In that case, drop the supplier's
+ * PM-runtime usage counter to remove the reference taken by
+ * pm_runtime_get_suppliers().
+ */
+ if (link->supplier_preactivated)
+ pm_runtime_put_noidle(link->supplier);
+
pm_request_idle(link->supplier);
put_device(link->consumer);
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 23cc4c377d77..949907e2e242 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1768,7 +1768,6 @@ void pm_runtime_get_suppliers(struct device *dev)
if (link->flags & DL_FLAG_PM_RUNTIME) {
link->supplier_preactivated = true;
pm_runtime_get_sync(link->supplier);
- refcount_inc(&link->rpm_active);
}
device_links_read_unlock(idx);
@@ -1788,19 +1787,8 @@ void pm_runtime_put_suppliers(struct device *dev)
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
device_links_read_lock_held())
if (link->supplier_preactivated) {
- bool put;
-
link->supplier_preactivated = false;
-
- spin_lock_irq(&dev->power.lock);
-
- put = pm_runtime_status_suspended(dev) &&
- refcount_dec_not_one(&link->rpm_active);
-
- spin_unlock_irq(&dev->power.lock);
-
- if (put)
- pm_runtime_put(link->supplier);
+ pm_runtime_put(link->supplier);
}
device_links_read_unlock(idx);
