PCI: pciehp: Handle push button event asynchronously
Use non-ordered workqueue for attention button events. Attention button events on each slot can be handled asynchronously. So we should use non-ordered workqueue. This patch also removes ordered workqueue in pciehp as a result. Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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