Linux-PCI Archive on lore.kernel.org
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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Keith Busch <keith.busch@intel.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Sinan Kaya <okaya@kernel.org>, Sasha Levin <sashal@kernel.org>,
	linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 079/191] PCI/AER: Take reference on error devices
Date: Sat,  9 Nov 2019 21:38:21 -0500
Message-ID: <20191110024013.29782-79-sashal@kernel.org> (raw)
In-Reply-To: <20191110024013.29782-1-sashal@kernel.org>

From: Keith Busch <keith.busch@intel.com>

[ Upstream commit 60271ab044a53edb9dcbe76bebea2221c4ff04d9 ]

Error handling may be running in parallel with a hot removal.  Reference
count the device during AER handling so the device can not be freed while
AER wants to reference it.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/pcie/aer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 637d638f73da5..ffbbd759683c5 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -866,7 +866,7 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
 static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
 {
 	if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
-		e_info->dev[e_info->error_dev_num] = dev;
+		e_info->dev[e_info->error_dev_num] = pci_dev_get(dev);
 		e_info->error_dev_num++;
 		return 0;
 	}
@@ -1013,6 +1013,7 @@ static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
 		pcie_do_nonfatal_recovery(dev);
 	else if (info->severity == AER_FATAL)
 		pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
+	pci_dev_put(dev);
 }
 
 #ifdef CONFIG_ACPI_APEI_PCIEAER
-- 
2.20.1


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191110024013.29782-1-sashal@kernel.org>
2019-11-10  2:37 ` [PATCH AUTOSEL 4.19 006/191] PCI/ACPI: Correct error message for ASPM disabling Sasha Levin
2019-11-10  2:37 ` [PATCH AUTOSEL 4.19 008/191] PCI: mediatek: Fix unchecked return value Sasha Levin
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 061/191] PCI: portdrv: Initialize service drivers directly Sasha Levin
2019-11-10  2:38 ` Sasha Levin [this message]
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 080/191] PCI/AER: Don't read upstream ports below fatal errors Sasha Levin
2019-11-10  2:38 ` [PATCH AUTOSEL 4.19 081/191] PCI/ERR: Use slot reset if available Sasha Levin
2019-11-10  2:39 ` [PATCH AUTOSEL 4.19 145/191] PCI/ERR: Run error recovery callbacks for all affected devices Sasha Levin

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