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

Wed Aug 29 16:15:33 CEST 2012

On 29 August 2012 16:13, Pascal Terjan <pterjan at gmail.com> wrote:
+>>> Oh yeah I meant to send a message to the list about this.
+>>>
+>>> 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.
+