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SubjectRe: [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@samsung.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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