Bluetooth: btusb: use irqsave() in URB's complete callback

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

On 2018-06-21 11:34:15 [-0400], Alan Stern wrote:
> On Thu, 21 Jun 2018, Sebastian Andrzej Siewior wrote:
> 
> > On 2018-06-21 14:43:41 [+0200], Marcel Holtmann wrote:
> > > can I get an ACK from someone ensuring that this is the direction we are going with the USB host controllers?
> > +Alan.
> > 
> > EHCI completes in BH since v3.12-rc1. In order to get rid of that
> > local_irq_save() in USB core code I need to make sure that the USB
> > device driver(s) use irqsave primitives. See
> >   https://lkml.kernel.org/r/Pine.LNX.4.44L0.1806011629140.1404-100000@iolanthe.rowland.org
> 
> Hi, Marcel!
Hi Marcel,

> Yes, Sebastian is right.  We are aiming to make it possible for the USB 
> core to invoke URB completion handlers with interrupts enabled, in 
> order to reduce latency (since USB interrupt processing can take a 
> fairly long time).  And of course, this means completion handlers have 
> to work correctly regardless of whether interrupts are enabled or 
> disabled.

I don't see this patch in linux-next. Do you still need some kind of
confirmation or has this been resolved?

> Currently ehci-hcd supports this possibility.  Other host controller 
> drivers may follow along; I'd like to see xhci-hcd do this too.
> 
> Alan Stern

Sebastian
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