Red Hat Bugzilla – Full Text Bug Listing
|Summary:||repeated hot plug of usb gps assigns incremental numbers|
|Product:||[Fedora] Fedora||Reporter:||Patrick Stanistreet <pystanis>|
|Status:||CLOSED NOTABUG||QA Contact:||Fedora Extras Quality Assurance <extras-qa>|
|Version:||17||CC:||harald, jonathan, udev-maint|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2012-05-22 11:51:10 EDT||Type:||Bug|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Patrick Stanistreet 2012-05-22 11:27:49 EDT
Description of problem: I plug usb gps into fc17 with all updates - previously always assigned /dev/ttyUSB0 now I get /dev/ttyUSB1 ,2 etc. Version-Release number of selected component (if applicable): How reproducible: disconnect usb gps then reconnect - check /var/logs/messages to see the device being assigned. Steps to Reproduce: 1. 2. 3. Actual results: Expected results: alway assign /dev/ttyUSB0 to the gps at connect time Additional info: it seems this change occurred very recently but not sure exactly when it happened as the first connection does assign /dev/ttyUSB0 and gps applications will work. After that though unplugging the gps and then plugging it back in get the wrong device id. /dev/ttyUSB1 and so on.
Comment 1 Patrick Stanistreet 2012-05-22 11:51:10 EDT
ok further testing today and navit is working so I give up there is definitely something odd but I cannot figure it out at the moment.
Comment 2 Kay Sievers 2012-05-22 12:04:05 EDT
That's all expected behavior. Kernel names are not predictable. On disconnect while the device is till in use the kernel device is busy, the reconnect will get the next free number, all usual and expected behaviour. You might want to use the /dev/serial/by-* links instead of the kernel names, they are predictable.