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From: Adrian Hunter <adrian.hunter@intel.com>
To: "Rafael J . Wysocki" <rafael@kernel.org>
Cc: linux-pm@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	"James E . J . Bottomley" <jejb@linux.ibm.com>,
	linux-scsi@vger.kernel.org, Avri Altman <avri.altman@wdc.com>,
	Bean Huo <huobean@gmail.com>, Can Guo <cang@codeaurora.org>,
	Asutosh Das <asutoshd@codeaurora.org>
Subject: [PATCH 1/2] PM: runtime: Fix ordering in pm_runtime_get_suppliers()
Date: Fri, 26 Mar 2021 12:56:18 +0200	[thread overview]
Message-ID: <20210326105619.27570-2-adrian.hunter@intel.com> (raw)
In-Reply-To: <20210326105619.27570-1-adrian.hunter@intel.com>

rpm_active indicates how many times the supplier usage_count has been
incremented. Consequently it must be updated after pm_runtime_get_sync() of
the supplier, not before.

Fixes: 4c06c4e6cf63 ("driver core: Fix possible supplier PM-usage counter imbalance")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/base/power/runtime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index d54e540067bf..4fde37713c58 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1690,8 +1690,8 @@ void pm_runtime_get_suppliers(struct device *dev)
 				device_links_read_lock_held())
 		if (link->flags & DL_FLAG_PM_RUNTIME) {
 			link->supplier_preactivated = true;
-			refcount_inc(&link->rpm_active);
 			pm_runtime_get_sync(link->supplier);
+			refcount_inc(&link->rpm_active);
 		}
 
 	device_links_read_unlock(idx);
-- 
2.17.1


  reply	other threads:[~2021-03-26 10:57 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 10:56 [PATCH 0/2] PM: runtime: Fix race getting/putting suppliers at probe Adrian Hunter
2021-03-26 10:56 ` Adrian Hunter [this message]
2021-03-26 10:56 ` [PATCH 2/2] " Adrian Hunter
2021-03-26 16:42 ` [PATCH 0/2] " Rafael J. Wysocki

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