[Mageia-dev] dropping /proc/bus/sub (Re: [changelog] [RPM] cauldron core/release systemd-189-2.mga3)

Wed Aug 29 16:16:00 CEST 2012

On 29 August 2012 16:15, Thierry Vignaud <thierry.vignaud at gmail.com> wrote:
+>>>> Yeah because we're now on kernel 3.5 we can no longer do certain things
+>>>> relating to this mount point.
+>>>>
+>>>> IIRC some ldetect stuff used it and some of the 3G and/or
+>>>> printer/scanner stuff might also depend on it and need to be migrated
+>>>> too. I don't know that code very well, but I know some folks complained
+>>>> when we stopped mounting it by default, so I've no doubt that it's use
+>>>> is lurking somewhere!
+>>>>
+>>>> I would guess that in some cases /dev/bus/usb/ might be sufficient for
+>>>> what is needed.
+>>>
+>>> Humm...
+>>> I've still around a patch making ldetect using libusb.
+>>> Sadly, we're missing some data...
+>>> Basically we would miss the kernel driver name binded with each usb device.
+>>>
+>>> We cannot workaround it since libusb misses with the ability to either
+>>> query the sysfs device path or to got the Port number
+>>> ("Port" in /proc/bus/usb/devices).
+>>> (I miss the Port number in order to compute the
+>>> /sys/bus/devices/usb/foobar path)
+>>>
+>>> W/o that I cannot retrieve the modalias which would help me to get the kernel
+>>> driver name.
+>>>
+>>> I guess I'll have to resurect that work and try harder to find some
+>>> workaround...
+>>
+>> Why not using sysfs for everything directly?
+>
+> Why not.
+> It's just sad to have everyone parse it instead if having a common library
+> exporting the needed data.
+
+See also http://sourceforge.net/apps/trac/libusbx/ticket/24
+