ehci: stop recursive calls to ehci_work_bh
Can happen with usb-storage devices: ehci_work_bh calls usb-storage,
usb-storage calls into block layer, block layer may run BHs.
Add a simple bool and just do nothing in case we figure ehci_work_bh is
active.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 20170612073109.25930-1-kraxel@redhat.com
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