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Commit aacf4a01 authored by Pete Zaitcev's avatar Pete Zaitcev Committed by Greg Kroah-Hartman
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usbmon: drop bogus 0t from usbmon.txt 



The example is incorrect: there is no 0t socket (the '1t' format has no
bus number in it). Also, correct the broken sentence for USB Tag.

Signed-off-by: default avatarPete Zaitcev <zaitcev@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 7c124149

Documentation/usb/usbmon.txt

+7 −5
Original line number Original line Diff line number Diff line
@@ -34,11 +34,12 @@ if usbmon is built into the kernel. 
Verify that bus sockets are present.

Verify that bus sockets are present.





# ls /sys/kernel/debug/usbmon

# ls /sys/kernel/debug/usbmon

0s  0t  0u  1s  1t  1u  2s  2t  2u  3s  3t  3u  4s  4t  4u

0s  0u  1s  1t  1u  2s  2t  2u  3s  3t  3u  4s  4t  4u

#

#





Now you can choose to either use the sockets numbered '0' (to capture packets on

Now you can choose to either use the socket '0u' (to capture packets on all

all buses), and skip to step #3, or find the bus used by your device with step #2.

buses), and skip to step #3, or find the bus used by your device with step #2.

This allows to filter away annoying devices that talk continuously.





2. Find which bus connects to the desired device

2. Find which bus connects to the desired device
@@ -99,8 +100,9 @@ on the event type, but there is a set of words, common for all types. 




Here is the list of words, from left to right:

Here is the list of words, from left to right:





- URB Tag. This is used to identify URBs is normally a kernel mode address

- URB Tag. This is used to identify URBs, and is normally an in-kernel address

 of the URB structure in hexadecimal.

  of the URB structure in hexadecimal, but can be a sequence number or any

  other unique string, within reason.





- Timestamp in microseconds, a decimal number. The timestamp's resolution

- Timestamp in microseconds, a decimal number. The timestamp's resolution

  depends on available clock, and so it can be much worse than a microsecond

  depends on available clock, and so it can be much worse than a microsecond