netdev - Re: [patch V2 11/15] completion: Use simple wait queues

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Date:   Thu, 19 Mar 2020 23:59:47 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Julian Calaby <julian.calaby@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-pci@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb <linux-usb@...r.kernel.org>,
        linux-wireless@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [patch V2 11/15] completion: Use simple wait queues

On Fri, Mar 20, 2020 at 10:25:41AM +1100, Julian Calaby wrote:
> > +++ b/drivers/usb/gadget/function/f_fs.c
> > @@ -1703,7 +1703,7 @@ static void ffs_data_put(struct ffs_data
> >                 pr_info("%s(): freeing\n", __func__);
> >                 ffs_data_clear(ffs);
> >                 BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
> > -                      waitqueue_active(&ffs->ep0req_completion.wait) ||
> > +                      swait_active(&ffs->ep0req_completion.wait) ||
> 
> This looks like some code is reaching deep into the dirty dark corners
> of the completion implementation, should there be some wrapper around
> this to hide that?

Or just remote it entirely..