On Fri, 22 Jun 2018 15:04:18 +0300 "Matwey V. Kornilov" <matwey@xxxxxxxxxx> 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] https://www.spinics.net/lists/linux-usb/msg165735.html > > Signed-off-by: Matwey V. Kornilov <matwey@xxxxxxxxxx> >From a tracing point of view: Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> -- Steve > --- > drivers/media/usb/pwc/pwc-if.c | 7 +++++ > include/trace/events/pwc.h | 64 ++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 71 insertions(+) > create mode 100644 include/trace/events/pwc.h > >
