[PATCH 4.16 REGRESSION fix 0/2] Bluetooth: Fix hci_bcm BT devices getting stuck in runtime-suspended status

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Hi All,

See the individual commit messages for the what and why of this series
only patch 1/2 is really necessary to fix the regression.

The regression changes a theoretical race window in the hci_bcm IRQ
handling into a real one and the first patch reverts the offending commit
making the race window a theoretical thing again (we would need a 5 second
stall in the right place to trigger it).

The second patch in the series contains a simple fix closing the theoretical
race window, this was tested with the regression still in place and it does
successfully get things unstuck after hitting the race. I guess this can
wait for 4.17, but I'm sending this out as a series as the patches were
developed in tandem.

This series was tested on an Asus T100CHI with a bcm43241b4 wifi/bt combo
chip. 

Regards,

Hans
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