linux-kernel - Re: [PATCHv2 2/2] xhci:prevent "callbacks suppressed" when debug is not enabled

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Date:	Tue, 27 Aug 2013 17:52:33 +0300
From:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
To:	Dmitry Kasatkin <d.kasatkin@...sung.com>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 2/2] xhci:prevent "callbacks suppressed" when debug is
 not enabled

Used vim "=" as Sarah suggested.

- Dmitry

On Tue, Aug 27, 2013 at 5:47 PM, Dmitry Kasatkin <d.kasatkin@...sung.com> 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 | 24 ++++++++----------------
>  1 file changed, 8 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> index 5b08cd8..3cbf1c0 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -3060,14 +3060,10 @@ 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"
> -                                       " (%d microframe%s) than xHCI "
> -                                       "(%d microframe%s)\n",
> -                                       ep_interval,
> -                                       ep_interval == 1 ? "" : "s",
> -                                       xhci_interval,
> -                                       xhci_interval == 1 ? "" : "s");
> +               dev_dbg_ratelimited(&urb->dev->dev,
> +                               "Driver uses different interval (%d microframe%s) than xHCI (%d microframe%s)\n",
> +                               ep_interval, ep_interval == 1 ? "" : "s",
> +                               xhci_interval, xhci_interval == 1 ? "" : "s");
>                 urb->interval = xhci_interval;
>                 /* Convert back to frames for LS/FS devices */
>                 if (urb->dev->speed == USB_SPEED_LOW ||
> @@ -3849,14 +3845,10 @@ int xhci_queue_isoc_tx_prepare(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"
> -                                       " (%d microframe%s) than xHCI "
> -                                       "(%d microframe%s)\n",
> -                                       ep_interval,
> -                                       ep_interval == 1 ? "" : "s",
> -                                       xhci_interval,
> -                                       xhci_interval == 1 ? "" : "s");
> +               dev_dbg_ratelimited(&urb->dev->dev,
> +                               "Driver uses different interval (%d microframe%s) than xHCI (%d microframe%s)\n",
> +                               ep_interval, ep_interval == 1 ? "" : "s",
> +                               xhci_interval, xhci_interval == 1 ? "" : "s");
>                 urb->interval = xhci_interval;
>                 /* Convert back to frames for LS/FS devices */
>                 if (urb->dev->speed == USB_SPEED_LOW ||
> --
> 1.8.1.2
>



-- 
Thanks,
Dmitry
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