From: <peter.wang@mediatek.com>
To: <matthias.bgg@gmail.com>, <len.brown@intel.com>, <pavel@ucw.cz>,
<rafael@kernel.org>, <gregkh@linuxfoundation.org>,
<stanley.chu@mediatek.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-pm@vger.kernel.org>,
<martin.petersen@oracle.com>, <avri.altman@wdc.com>,
<alim.akhtar@samsung.com>, <jejb@linux.ibm.com>
Cc: <wsd_upstream@mediatek.com>, <linux-mediatek@lists.infradead.org>,
<peter.wang@mediatek.com>, <chun-hung.wu@mediatek.com>,
<alice.chao@mediatek.com>, <cc.chou@mediatek.com>,
<chaotian.jing@mediatek.com>, <jiajie.hao@mediatek.com>,
<powen.kao@mediatek.com>, <qilin.tan@mediatek.com>,
<lin.gui@mediatek.com>, <tun-yu.yu@mediatek.com>
Subject: [PATCH v2] PM-runtime: Check supplier_preactivated before release supplier
Date: Tue, 28 Jun 2022 10:12:44 +0800 [thread overview]
Message-ID: <20220628021244.17281-1-peter.wang@mediatek.com> (raw)
From: Peter Wang <peter.wang@mediatek.com>
With divice link of DL_FLAG_PM_RUNTIME, if consumer call pm_runtime_get_suppliers
to prevent supplier enter suspend, pm_runtime_release_supplier should
check supplier_preactivated before let supplier enter suspend.
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
---
drivers/base/power/runtime.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 676dc72d912d..08bbc4561e60 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -337,8 +337,10 @@ static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
struct device_link *link;
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
- device_links_read_lock_held())
- pm_runtime_release_supplier(link, try_to_suspend);
+ device_links_read_lock_held()) {
+ if (!link->supplier_preactivated)
+ pm_runtime_release_supplier(link, try_to_suspend);
+ }
}
static void rpm_put_suppliers(struct device *dev)
--
2.18.0
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