Hi Forest,
On Wed, 9 Dec 2009 10:32:25 -0500, Forest Bond wrote:
> I am seeing a situation where sensors-detect fails to find sensors in a single
> run due to an apparent race condition. It looks like it loads the i2c-* modules
> and then tries to open /dev/i2c-0 for probing, but it fails to open
> successfully. My sense is that the device is not fully initialize and ready for
> opening immediately following the modprobe calls, but sensors-detect does not
> wait for initialization to complete. I'm not sure what should be happening. It
> seems sensible that modprobe would not return until the device is initialized.
>
> Running sensors-detect again correctly probes the hardware because the i2c bus
> is fully initialized at that point.
You must be typing very fast to be able to trigger this ;) Or udev is
very slow populating /dev on your machine.
> I don't know anything about i2c, so I hope the language I'm using to describe
> this situation is reasonable.
It is perfect.
> I've attached the output from sensors-detect for the first (failed) run and the
> second (successful) run.
>
> Thoughts?
The version of the sensors-detect you're using is getting old. Please
give a try to the latest one:
http://dl.lm-sensors.org/lm-sensors/files/sensors-detect
If you can still reproduce the problem, then please give a try to the
attached patch and report.
--
Jean Delvare
http://khali.linux-fr.org/wishlist.html
Index: sensors-detect
===================================================================
--- sensors-detect (révision 5808)
+++ sensors-detect (copie de travail)
@@ -5812,6 +5812,12 @@
$by_default = 1 if dmi_match('board_vendor', 'asustek', 'tyan',
'supermicro');
+ # udev may take some time to create the device node
+ if (!(-x "/sbin/udevadm" && system("/sbin/udevadm settle") == 0)
+ && !(-x "/sbin/udevsettle" && system("/sbin/udevsettle") == 0)) {
+ sleep(1);
+ }
+
for (my $dev_nr = 0; $dev_nr < @i2c_adapters; $dev_nr++) {
next unless exists $i2c_adapters[$dev_nr];
scan_i2c_adapter($dev_nr, $by_default);
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