On Sun, 28 Apr 2013, Sedat Dilek wrote: > This is a give-back to USB folks who helped me in a USB debug issue. Thanks for sending this. Here are some suggestions for minor improvements. > Signed-off-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> > --- > Documentation/usb/usbmon.txt | 87 ++++++++++++++++++++++++++++---------------- > 1 file changed, 55 insertions(+), 32 deletions(-) > > diff --git a/Documentation/usb/usbmon.txt b/Documentation/usb/usbmon.txt > index c42bb9c..02f5845 100644 > --- a/Documentation/usb/usbmon.txt > +++ b/Documentation/usb/usbmon.txt > @@ -23,35 +23,53 @@ in a text format. This is used for two purposes. First, it serves as a > common trace exchange format for tools while more sophisticated formats > are finalized. Second, humans can read it in case tools are not available. > > -To collect a raw text trace, execute following steps. > +To collect a (raw text) usbmon trace, execute the following steps. Might as well leave out the parentheses. > > -1. Prepare > +Step #1: Prerequisites and preperation s/preperation/preparation/ > > -Mount debugfs (it has to be enabled in your kernel configuration), and > -load the usbmon module (if built as module). The second step is skipped > -if usbmon is built into the kernel. > +You should enable the following kernel-config options: > > -# mount -t debugfs none_debugs /sys/kernel/debug > -# modprobe usbmon > -# > +CONFIG_DEBUG_FS=y <--- Enable DebugFS > +CONFIG_USB_DEBUG=y <--- Enable USB debugging As far as I know, CONFIG_USB_DEBUG is not needed. > +CONFIG_USB_MON=m <--- Build usbmon as kernel-module This could be either 'm' or 'y'. Many distributions set it to 'y'. > > -Verify that bus sockets are present. > +Mount debugfs and load usbmon module: > > -# ls /sys/kernel/debug/usb/usbmon > -0s 0u 1s 1t 1u 2s 2t 2u 3s 3t 3u 4s 4t 4u > -# > + # mount -t debugfs none_debugs /sys/kernel/debug Distributions normally do this for you. > > -Now you can choose to either use the socket '0u' (to capture packets on all > + # modprobe -v usbmon > + insmod /lib/modules/$(uname -r)/kernel/drivers/usb/mon/usbmon.ko The complicated insmod command isn't needed; modprobe works perfectly well. > + > +The second step is skipped if usbmon is built into the kernel. This is unclear. "second step" sounds like it refers to Step #2 below. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
