linux-kernel - Re: [PATCH 2/2] xhci:prevent "callbacks suppressed" when debug is not enabled

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Date:	Fri, 16 Aug 2013 10:30:00 -0700
From:	Sarah Sharp <sarah.a.sharp@...el.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Dmitry Kasatkin <d.kasatkin@...sung.com>,
	linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com
Subject: Re: [PATCH 2/2] xhci:prevent "callbacks suppressed" when debug is
 not enabled

On Fri, Aug 16, 2013 at 10:26:35AM -0700, Sarah Sharp wrote:
> On Thu, Aug 15, 2013 at 05:17:16PM -0700, Greg KH wrote:
> > On Thu, Aug 15, 2013 at 07:04:55PM +0300, Dmitry Kasatkin wrote:
> > > When debug is not enabled and dev_dbg() will expand to nothing,
> > > log might be flooded with "callbacks suppressed". If it was not
> > > done on purpose, better to use dev_dbg_ratelimited() instead.
> > > 
> > > Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
> > > ---
> > >  drivers/usb/host/xhci-ring.c | 6 ++----
> > >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > 
> > Sarah, does this patch conflict with the trace debug patches being
> > worked on?  I'll hold off on applying it for now, let me know if it's ok
> > or not.
> 
> It doesn't conflict with the trace debug patches, because those only
> effect debugging with xhci_dbg with the host device, not dev_dbg with
> the USB device.  This should apply fine to usb-next.

At another glance, the patch removes two if blocks, but doesn't
re-indent the rest of the lines:

> @@ -3060,8 +3060,7 @@ int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
>        * to set the polling interval (once the API is added).
>        */
>       if (xhci_interval != ep_interval) {
> -             if (printk_ratelimit())
> -                     dev_dbg(&urb->dev->dev, "Driver uses different interval"
> +             dev_dbg_ratelimited(&urb->dev->dev, "Driver uses different interval"
>                                       " (%d microframe%s) than xHCI "
>                                       "(%d microframe%s)\n",
>                                       ep_interval,

That should probably be fixed.

Sarah Sharp
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