linux-kernel - Re: [PATCH AUTOSEL 4.18 02/88] usb: usbtest: use irqsave() in USB's complete callback

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Date:   Fri, 7 Sep 2018 07:42:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH AUTOSEL 4.18 02/88] usb: usbtest: use irqsave() in USB's
 complete callback

On Fri, Sep 07, 2018 at 12:35:52AM +0000, Sasha Levin wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> [ Upstream commit 6f3fde684d0232e66ada3410f016a58e09a87689 ]
> 
> The USB completion callback does not disable interrupts while acquiring
> the lock. We want to remove the local_irq_disable() invocation from
> __usb_hcd_giveback_urb() and therefore it is required for the callback
> handler to disable the interrupts while acquiring the lock.
> The callback may be invoked either in IRQ or BH context depending on the
> USB host controller.
> Use the _irqsave() variant of the locking primitives.

All of the "use irqsave in USB's complete callback" patches are not
stable material as they are prep work for changes that have yet to hit
Linus's tree.

So you can drop this one.

thanks,

greg k-h