linux-kernel - [PATCH 5/5 V4] PCI/ERR: don't mix io state not changed and no driver together

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Message-Id: <20200927082736.14633-6-haifeng.zhao@intel.com>
Date:   Sun, 27 Sep 2020 04:27:36 -0400
From:   Ethan Zhao <haifeng.zhao@...el.com>
To:     bhelgaas@...gle.com, oohall@...il.com, ruscur@...sell.cc,
        lukas@...ner.de, andriy.shevchenko@...ux.intel.com,
        stuart.w.hayes@...il.com, mr.nuke.me@...il.com,
        mika.westerberg@...ux.intel.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        pei.p.jia@...el.com, ashok.raj@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...el.com, hch@...radead.org,
        joe@...ches.com, Ethan Zhao <haifeng.zhao@...el.com>
Subject: [PATCH 5/5 V4] PCI/ERR: don't mix io state not changed and no driver together

When we see 'can't recover (no error_detected callback)' on console,
Maybe the reason is io state is not changed by calling
pci_dev_set_io_state(), that is confused. fix it.

Signed-off-by: Ethan Zhao <haifeng.zhao@...el.com>
Tested-by: Wen Jin <wen.jin@...el.com>
Tested-by: Shanshan Zhang <ShanshanX.Zhang@...el.com>
---
Chagnes:
 V2: no change.
 V3: no change.
 V4: no change.

 drivers/pci/pcie/err.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index e35c4480c86b..d85f27c90c26 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -55,8 +55,10 @@ static int report_error_detected(struct pci_dev *dev,
 	if (!pci_dev_get(dev))
 		return 0;
 	device_lock(&dev->dev);
-	if (!pci_dev_set_io_state(dev, state) ||
-		!dev->driver ||
+	if (!pci_dev_set_io_state(dev, state)) {
+		pci_dbg(dev, "Device might already being in error handling ...\n");
+		vote = PCI_ERS_RESULT_NONE;
+	} else if (!dev->driver ||
 		!dev->driver->err_handler ||
 		!dev->driver->err_handler->error_detected) {
 		/*
-- 
2.18.4