Messages in this thread | | | From | Arkadiusz Miskiewicz <> | Subject | Re: loading ipmi_watchdog causes tons of other watchdog modules to be loaded | Date | Thu, 9 Oct 2008 22:18:28 +0200 |
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On Thursday 09 of October 2008, Kay Sievers wrote: > On Thu, Oct 9, 2008 at 9:02 PM, Arkadiusz Miskiewicz > > <a.miskiewicz@gmail.com> wrote: > > On Thursday 09 October 2008, Kay Sievers wrote: > >> On Thu, Oct 9, 2008 at 7:22 PM, Arkadiusz Miskiewicz > >> > >> > ... but that ipmi_watchdog is the correct driver that handles > >> > /dev/watchdog, so this shouldn't be happening, correct? > >> > >> While the driver you expect to work is loaded, what does: > >> ls -l /dev/watchdog > >> print? > >> > >> If the devno of this node is 10:130, what does: > >> find /sys/class /sys/devices/ -name dev | xargs grep 10:130 > >> print? > > > > # ls -l /dev/watchdog > > crw------- 1 root root 10, 130 sie 8 17:00 /dev/watchdog > > # find /sys/class /sys/devices/ -name dev | xargs grep 10:130 > > /sys/class/misc/watchdog/dev:10:130 > > Ok, so you actually have a driver bound to that device number, and it > should not trigger the usual module autoloading mechanism. > > What does: > ls -l /sys/class/misc/watchdog/
# ls -l /sys/class/misc/watchdog/ razem 0 -r--r--r-- 1 root root 4096 paź 9 22:02 dev drwxr-xr-x 2 root root 0 paź 9 22:02 power lrwxrwxrwx 1 root root 0 paź 9 22:22 subsystem -> ../../misc -rw-r--r-- 1 root root 4096 paź 9 22:02 uevent
> and > ls -l /sys/class/misc/watchdog/device/ > print?
# LC_ALL=C ls -l /sys/class/misc/watchdog/device/ ls: cannot access /sys/class/misc/watchdog/device/: No such file or directory
> Does the /sys/class/misc/watchdog/ directory exist, before you load > the module you expect to be the driver behind /dev/watchdog?
It doesn't exist before. modprobe ipmi_watchdog, then /sys/class/misc/watchdog/ becomes available.
> To clarify, the other modules get loaded, after you loaded but module, > the above /sys/class/misc/watchdog/ directory exists, and only if you > read from the device, all the other modules get loaded?
Exactly. I load ipmi_watchdog, /sys/class/misc/watchdog/ becomes available (no /sys/class/misc/watchdog/device/ though), then cat /dev/watchdog and this causes that other watchdog modules are loaded.
> Kay
-- Arkadiusz Miśkiewicz PLD/Linux Team arekm / maven.pl http://ftp.pld-linux.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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