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Date: Sat, 08 Sep 2007 20:08:34 +0300 From: Anssi Hannula <anssi.hannula@...il.com> To: Dmitry Torokhov <dtor@...ightbb.com> CC: linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org Subject: sysfs change of input/event devices in 2.6.23rc breaks udev Hi! There seem to be changes in sysfs input structure between 2.6.22 and 2.6.23-rc5 which cause some breakage. With 2.6.22: > # LC_ALL=C ls -l /sys/class/input/input4 > total 0 > drwxr-xr-x 2 root root 0 Sep 8 12:51 capabilities/ > lrwxrwxrwx 1 root root 0 Sep 8 19:48 device -> ../../../devices/platform/pcspkr/ > drwxr-xr-x 2 root root 0 Sep 8 12:51 event4/ > drwxr-xr-x 2 root root 0 Sep 8 12:51 id/ > -r--r--r-- 1 root root 4096 Sep 8 19:48 modalias > -r--r--r-- 1 root root 4096 Sep 8 19:48 name > -r--r--r-- 1 root root 4096 Sep 8 19:48 phys > lrwxrwxrwx 1 root root 0 Sep 8 19:48 subsystem -> ../../../class/input/ > --w------- 1 root root 4096 Sep 8 19:48 uevent > -r--r--r-- 1 root root 4096 Sep 8 19:48 uniq > # ls -l /sys/class/input/event4 > lrwxrwxrwx 1 root root 0 Sep 8 19:48 /sys/class/input/event4 -> ../../class/input/input4/event4/ > # ls -l /sys/class/input/event4/ > total 0 > -r--r--r-- 1 root root 4096 Sep 8 19:58 dev > lrwxrwxrwx 1 root root 0 Sep 8 19:58 device -> ../../../../devices/platform/pcspkr/ > lrwxrwxrwx 1 root root 0 Sep 8 19:58 subsystem -> ../../../../class/input/ > --w------- 1 root root 4096 Sep 8 19:58 uevent With 2.6.23-rc5: > # ls -l /sys/class/input/input5 > total 0 > drwxr-xr-x 2 root root 0 Sep 8 19:47 capabilities/ > lrwxrwxrwx 1 root root 0 Sep 8 19:03 device -> ../../../devices/platform/pcspkr/ > drwxr-xr-x 2 root root 0 Sep 8 19:47 id/ > lrwxrwxrwx 1 root root 0 Sep 8 19:47 input:event5 -> ../../../class/input/event5/ > -r--r--r-- 1 root root 4096 Sep 8 19:03 modalias > -r--r--r-- 1 root root 4096 Sep 8 19:03 name > -r--r--r-- 1 root root 4096 Sep 8 19:47 phys > drwxr-xr-x 2 root root 0 Sep 8 19:47 power/ > lrwxrwxrwx 1 root root 0 Sep 8 19:03 subsystem -> ../../../class/input/ > -rw-r--r-- 1 root root 4096 Sep 8 19:03 uevent > -r--r--r-- 1 root root 4096 Sep 8 19:47 uniq > # ls -l /sys/class/input/event5 > total 0 > -r--r--r-- 1 root root 4096 Sep 8 19:03 dev > lrwxrwxrwx 1 root root 0 Sep 8 19:03 device -> ../../../class/input/input5/ > drwxr-xr-x 2 root root 0 Sep 8 19:48 power/ > lrwxrwxrwx 1 root root 0 Sep 8 19:03 subsystem -> ../../../class/input/ > -rw-r--r-- 1 root root 4096 Sep 8 19:03 uevent There are a few changes. There is no longer: /sys/class/input/eventX => /sys/class/input/inputX/eventX instead there is: /sys/class/inputX/input:eventX => /sys/class/input/eventX Notice the added "input:". I don't know if any software depends on this, though. However, the change that broke id_path of udev is that /sys/class/input/event5/device is now a symlink to the inputX directory instead of being the same as the device symlink in inputX directory, i.e. to ../../../devices/platform/pcspkr in this case. Udev id_path uses that directory to construct the ID_PATH variable. Should the sysfs structure be reverted or should udev be adapted to handle traversing /device symlink twice? I think the former, as there should be considerably more time to adapt udev for coming changes in sysfs. -- Anssi Hannula - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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