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Date:   Tue, 21 Aug 2018 15:49:25 -0400
From:   Steven Rostedt <>
To:     "Matwey V. Kornilov" <>
Subject: Re: [PATCH v5 1/2] media: usb: pwc: Introduce TRACE_EVENTs for

On Tue, 21 Aug 2018 20:06:28 +0300
"Matwey V. Kornilov" <> wrote:

> There were reports that PWC-based webcams don't work at some
> embedded ARM platforms. [1] Isochronous transfer handler seems to
> work too long leading to the issues in MUSB USB host subsystem.
> Also note, that urb->giveback() handlers are still called with
> disabled interrupts. In order to be able to measure performance of
> PWC driver, traces are introduced in URB handler section.
> [1]
> Signed-off-by: Matwey V. Kornilov <>
> ---

>From a tracing perspective,

Reviewed-by: Steven Rostedt (VMware) <>

-- Steve

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