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authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>2004-10-05 21:35:39 -0700
committerGreg KH <gregkh@suse.de>2005-04-26 21:37:02 -0700
commita8b5267a629f21c30d4e94ec82be193009803ddd (patch)
tree49b2163c6841dd437d7b1112b0df990dab5faf32 /Makefile
parent01f950e2eb86563255a269ecadd386cbe5361d0c (diff)
[PATCH] finally solve the bad sysfs-timing for all of us
On Tue, Sep 21, 2004 at 07:17:34PM +0200, Kay Sievers wrote: > During the integration of HAL into the linux hotplug system, we dicover > every week a new signaling path that fails cause of the delayed > population of the sysfs files, which are connected by symlinks and > appear in something like a random order in userspace. > > It's pretty complicated to understand the connection between all these > files for all the different subsystems with all the exceptions, so most > of the users simply sleep a few seconds, but that is not acceptable for > our integration work. > > Here I try to get all the special knowledge about that behavior together > and place that in a simple binary. That program _must_ run first of all > other hotplug processsing and every later script, udev or HAL all can get > rid of the wild guesses about the right time sysfs is ready. > > It will not only wait for the "dev"-file events we handle with udev, also > for every /device-device with the corresponding bus link. > > It is provided as a patch against the current udev tree and a "install" will > place the new program in the hotplug.d directory: > > [kay@pim ~]$ tree /etc/hotplug.d/ > /etc/hotplug.d/ > `-- default > |-- 00-wait_for_sysfs.hotplug -> /sbin/wait_for_sysfs > |-- 10-udev.hotplug -> /sbin/udevsend > |-- 20-hal.hotplug -> /usr/libexec/hal.hotplug > |-- default.hotplug > `-- log.hotplug > > > For now, it logs the result of the waiting to syslog, to catch any > device, that needs special treatment. All newly discovered delay problems, > device black/whitelist updates should go into that program and we may remove > that kind of specialisation from all the other hotplug programs. > > Any patches, reports, testing is more than welcome. > > Sample debug: > Sep 21 18:44:07 localhost kernel: usb 3-2: new full speed USB device using address 12 > Sep 21 18:44:07 localhost kernel: hub 3-2:1.0: USB hub found > Sep 21 18:44:07 localhost kernel: hub 3-2:1.0: 2 ports detected > Sep 21 18:44:07 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2' > Sep 21 18:44:07 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0' > Sep 21 18:44:08 localhost kernel: usb 3-2.1: new full speed USB device using address 13 > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/class/usb/lp0' > Sep 21 18:44:08 localhost kernel: drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer dev 13 if 0 alt 1 proto 2 vid 0x067B pid 0x2305 > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.1/3-2.1:1.0' > Sep 21 18:44:08 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.1' > Sep 21 18:44:08 localhost udev: configured rule in '/etc/udev/rules.d/50-udev.rules' at line 29 applied, 'lp0' becomes 'usb/%k' > Sep 21 18:44:08 localhost udev: creating device node '/udev/usb/lp0' > Sep 21 18:44:09 localhost kernel: usb 3-2.2: new full speed USB device using address 14 > Sep 21 18:44:09 localhost kernel: pl2303 3-2.2:1.0: PL-2303 converter detected > Sep 21 18:44:09 localhost kernel: usb 3-2.2: PL-2303 converter now attached to ttyUSB0 > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2/3-2.2:1.0' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2.2/3-2.2:1.0/ttyUSB0' > Sep 21 18:44:09 localhost 00-wait_for_sysfs.hotplug: result: waiting for sysfs successful '/class/tty/ttyUSB0' > Sep 21 18:44:09 localhost udev: creating device node '/udev/ttyUSB0' New version with more devices excluded from /device-link saerch and a better maching for device names.
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile15
1 files changed, 12 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index bc2f852614..67a7d46525 100644
--- a/Makefile
+++ b/Makefile
@@ -33,6 +33,7 @@ INFO = udevinfo
TESTER = udevtest
STARTER = udevstart
RULER = udevruler
+WAIT = wait_for_sysfs
VERSION = 032_bk
INSTALL_DIR = /usr/local/bin
RELEASE_NAME = $(ROOT)-$(VERSION)
@@ -171,7 +172,7 @@ endif
CFLAGS += -I$(PWD)/libsysfs
-all: $(ROOT) $(SENDER) $(DAEMON) $(INFO) $(TESTER)
+all: $(ROOT) $(SENDER) $(DAEMON) $(INFO) $(TESTER) $(WAIT)
@extras="$(EXTRAS)" ; for target in $$extras ; do \
echo $$target ; \
$(MAKE) prefix=$(prefix) \
@@ -287,10 +288,14 @@ $(RULER): $(LIBC) $(RULER).o $(OBJS) $(HEADERS)
$(LD) $(LDFLAGS) -o $@ $(CRT0) udevruler.o udev_lib.o udev_config.o udevdb.o $(SYSFS) $(TDB) $(LIB_OBJS) $(ARCH_LIB_OBJS) -lnewt
$(STRIPCMD) $@
+$(WAIT): $(WAIT).o $(OBJS) $(HEADERS) $(LIBC)
+ $(LD) $(LDFLAGS) -o $@ $(CRT0) $(WAIT).o $(SYSFS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
+ $(STRIPCMD) $@
+
clean:
-find . \( -not -type d \) -and \( -name '*~' -o -name '*.[oas]' \) -type f -print \
| xargs rm -f
- -rm -f core $(ROOT) $(GEN_HEADERS) $(GEN_CONFIGS) $(GEN_MANPAGES) $(INFO) $(DAEMON) $(SENDER) $(TESTER) $(RULER)
+ -rm -f core $(ROOT) $(GEN_HEADERS) $(GEN_CONFIGS) $(GEN_MANPAGES) $(INFO) $(DAEMON) $(SENDER) $(TESTER) $(RULER) $(WAIT)
$(MAKE) -C klibc clean
@extras="$(EXTRAS)" ; for target in $$extras ; do \
echo $$target ; \
@@ -391,8 +396,10 @@ install: install-initscript install-config install-man install-dev.d all
$(INSTALL_PROGRAM) -D $(SENDER) $(DESTDIR)$(sbindir)/$(SENDER)
$(INSTALL_PROGRAM) -D $(INFO) $(DESTDIR)$(usrbindir)/$(INFO)
$(INSTALL_PROGRAM) -D $(TESTER) $(DESTDIR)$(usrbindir)/$(TESTER)
- ln -sf $(sbindir)/udev $(DESTDIR)$(sbindir)/$(STARTER)
+ $(INSTALL_PROGRAM) -D $(WAIT) $(DESTDIR)$(sbindir)/$(WAIT)
+ - ln -f -s $(sbindir)/udev $(DESTDIR)$(sbindir)/$(STARTER)
- ln -f -s $(sbindir)/$(SENDER) $(DESTDIR)$(hotplugdir)/10-udev.hotplug
+ - ln -f -s $(sbindir)/$(WAIT) $(DESTDIR)$(hotplugdir)/00-wait_for_sysfs.hotplug
ifndef DESTDIR
- killall udevd
- rm -f $(udevdir)/.udev.tdb
@@ -405,6 +412,7 @@ endif
uninstall: uninstall-man uninstall-dev.d
- rm $(hotplugdir)/10-udev.hotplug
+ - rm $(hotplugdir)/00-wait_for_sysfs.hotplug
- rm $(configdir)/rules.d/50-udev.rules
- rm $(configdir)/permissions.d/50-udev.permissions
- rm $(configdir)/udev.conf
@@ -418,6 +426,7 @@ uninstall: uninstall-man uninstall-dev.d
- rm $(sbindir)/$(STARTER)
- rm $(usrbindir)/$(INFO)
- rm $(usrbindir)/$(TESTER)
+ - rm $(usrbindir)/$(WAIT)
- rmdir $(hotplugdir)
- rm $(udevdir)/.udev.tdb
- rmdir $(udevdir)