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PCI/AER: Take reference on error devices 

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>
This commit is contained in:
Keith Busch 2018-09-20 10:27:09 -06:00 committed by Bjorn Helgaas
parent 4f802170a8
commit 60271ab044
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/pcie/aer.c
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@ -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