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Message-Id: <20220607164952.670970245@linuxfoundation.org>
Date: Tue, 7 Jun 2022 18:55:15 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Yihang Li <liyihang6@...ilicon.com>,
Xiang Chen <chenxiang66@...ilicon.com>,
John Garry <john.garry@...wei.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 123/772] scsi: hisi_sas: Undo RPM resume for failed notify phy event for v3 HW
From: Xiang Chen <chenxiang66@...ilicon.com>
[ Upstream commit 9b5387fe5af38116b452259d87cd66594b6277c1 ]
If we fail to notify the phy up event then undo the RPM resume, as the phy
up notify event handling pairs with that RPM resume.
Link: https://lore.kernel.org/r/1651839939-101188-1-git-send-email-john.garry@huawei.com
Reported-by: Yihang Li <liyihang6@...ilicon.com>
Tested-by: Yihang Li <liyihang6@...ilicon.com>
Signed-off-by: Xiang Chen <chenxiang66@...ilicon.com>
Signed-off-by: John Garry <john.garry@...wei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 52089538e9de..b309a9d0f5b7 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -1561,9 +1561,15 @@ static irqreturn_t phy_up_v3_hw(int phy_no, struct hisi_hba *hisi_hba)
phy->port_id = port_id;
- /* Call pm_runtime_put_sync() with pairs in hisi_sas_phyup_pm_work() */
+ /*
+ * Call pm_runtime_get_noresume() which pairs with
+ * hisi_sas_phyup_pm_work() -> pm_runtime_put_sync().
+ * For failure call pm_runtime_put() as we are in a hardirq context.
+ */
pm_runtime_get_noresume(dev);
- hisi_sas_notify_phy_event(phy, HISI_PHYE_PHY_UP_PM);
+ res = hisi_sas_notify_phy_event(phy, HISI_PHYE_PHY_UP_PM);
+ if (!res)
+ pm_runtime_put(dev);
res = IRQ_HANDLED;
--
2.35.1
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