[PATCH AUTOSEL 4.19 079/191] PCI/AER: Take reference on error devices
From: Sasha Levin <sashal@kernel.org>
Date: 2019-11-10 02:42:52
Also in:
linux-pci, lkml, stable
Subsystem:
pci enhanced error handling (eeh) for powerpc, pci subsystem, the rest · Maintainers:
Mahesh J Salgaonkar, Bjorn Helgaas, Linus Torvalds
From: Keith Busch <redacted> [ 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 <redacted> 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
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2.20.1