Todd Denniston wrote on 12/ 4/06 11:59 AM:
Ludovic and others,
I noticed the a bug report on ubuntu[1] that mentioned "/proc/bus/usb is
a pseudo-filesystem that ... [has] been deprecated and unsupported for a
while now, and is on gregkh's hit list of things to be removed from the
kernel entirely."[3]
so for kicks on my Fedora Core 4 machine, where /proc/bus/usb is mounted
when /proc is, I stopped pcscd, mounted a zip disk over /proc/bus/usb
(mount /dev/sda4 /proc/bus/usb) to mask it out, and then restarted pcscd.
pcscd never noticed my reader, even when it was unplugged and replugged,
which the kernel did notice (syslog output).
I suppose this may be a bug in libusb[2], but it does affect pcscd, and
at least pcsc-lite-1.3.[12]/src/hotplug_linux.c line 40 "#define
PCSCLITE_USB_PATH" points at /proc/bus/usb.
Or does someone see a big fault with the test I did above, or my
understanding of what is going to be deprecated?
Todd,
Do you have pcsc-lite built with libusb support? hotplug_linux.c is
entirely surrounded with:
#if defined(__linux__) && !defined(HAVE_LIBUSB)
...
#endif /* __linux__ && !HAVE_LIBUSB */
So if you have libusb support enabled, that code shouldn't be used.
~Iain
[1]
https://launchpad.net/distros/ubuntu/+source/sysvinit/+bug/35004/comments/9
https://launchpad.net/distros/ubuntu/+source/sysvinit/+bug/35004/comments/17
[2] FC4 is running libusb-0.1.10a-1, libusb-devel-0.1.10a-1.
[3] I think the GregKH message about proc/bus/usb deprecated is one of
these:
http://sourceforge.net/mailarchive/message.php?msg_id=12695120
The following looks to be a reply to that message by the libusb maintainer:
http://marc.theaimsgroup.com/?l=linux-hotplug-devel&m=112447064921992&q=raw
http://sourceforge.net/mailarchive/message.php?msg_id=12695893
As others surrounding this issue noted, it would be nice if Greg had a
list laying around that explicitly indicated what he was killing and
roughly when. The thread where he said /proc/bus/usb/???/ is now dead,
was a little over a year ago.
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