On Wed, Jul 13, 2016 at 08:58:48AM +0530, Malith Yapa wrote: > The reason for the random disconnects is apparently EMI related. > > Mar 1 07:09:09 localhost kernel: [265922.921985] hub 5-0:1.0: port 1 > disabled by hub (EMI?), re-enabling... > > This is very much a possibility because the box is in a high current > industrial control panel. That is not an issue because the device > automatically reconnects. > But after a few day's operation it stops reconnecting and i finally > managed to capture the syslog. > > Mar 1 07:09:09 localhost kernel: [265922.934119] usb 5-1: USB > disconnect, device number 83 > Mar 1 07:09:10 localhost kernel: [265923.245580] usb 5-1: new > full-speed USB device number 84 using sw-ohci > Mar 1 07:09:10 localhost kernel: [265923.451746] pl2303 5-1:1.0: > pl2303 converter detected > Mar 1 07:09:10 localhost kernel: [265923.486633] pl2303 5-1:1.0: No > more free serial devices > Mar 1 07:09:10 localhost kernel: [265923.496483] pl2303: probe of > 5-1:1.0 failed with error -5 > Mar 1 07:09:10 localhost mtp-probe: checking bus 5, device 84: > "/sys/devices/platform/sw-ohci.2/usb5/5-1" > Mar 1 07:09:10 localhost mtp-probe: bus: 5, device: 84 was not an MTP device > > The driver issues "No more free serial devices". > > The two reasons i can see for this are either if the malloc fails (but > there's no "out of memory" error) or if minor numbers have exceeded > the limit. But the minor is only 84! > > Any pointers for a solution? Are you sure you are properly closing up the device node when the disconnect happens? That looks to be the problem here. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
