From: Kay Sievers Date: Thu, 5 May 2011 11:32:05 +0000 (+0200) Subject: reboot: disable usermodehelper to prevent fs access X-Git-Tag: v3.0-rc1~390^2~9 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b50fa7c8077c625919b1e0a75fc37b825f024518;p=karo-tx-linux.git reboot: disable usermodehelper to prevent fs access In case CONFIG_UEVENT_HELPER_PATH is not set to "", which it should be on every system, the kernel forks processes during shutdown, which try to access the rootfs, even when the binary does not exist. It causes exceptions and long delays in the disk driver, which gets read requests at the time it tries to shut down the disk. This patch disables all kernel-forked processes during reboot to allow a clean poweroff. Cc: Tejun Heo Tested-By: Anton Guda Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- diff --git a/kernel/sys.c b/kernel/sys.c index af468edf096a..70c4c5159420 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -314,6 +314,7 @@ void kernel_restart_prepare(char *cmd) { blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); system_state = SYSTEM_RESTART; + usermodehelper_disable(); device_shutdown(); sysdev_shutdown(); syscore_shutdown(); @@ -344,6 +345,7 @@ static void kernel_shutdown_prepare(enum system_states state) blocking_notifier_call_chain(&reboot_notifier_list, (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); system_state = state; + usermodehelper_disable(); device_shutdown(); } /**