PCI AER: support invalid error source IDs
When the bus id part of error source id is equal to 0 or nosourceid=1, make the kernel probe the AER status registers of all devices under the root port to find the initial error reporter. Reviewed-by: NAndrew Patterson <andrew.patterson@hp.com> Signed-off-by: NZhang Yanmin <yanmin_zhang@linux.intel.com> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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