ext4: init timer earlier to avoid a kernel panic in __save_error_info
During mount, when we fail to open journal inode or root inode, the __save_error_info will mod_timer. But actually s_err_report isn't initialized yet and the kernel oops. The detailed information can be found https://bugzilla.kernel.org/show_bug.cgi?id=32082. The best way is to check whether the timer s_err_report is initialized or not. But it seems that in include/linux/timer.h, we can't find a good function to check the status of this timer, so this patch just move the initializtion of s_err_report earlier so that we can avoid the kernel panic. The corresponding del_timer is also added in the error path. Reported-by: NSami Liedes <sliedes@cc.hut.fi> Signed-off-by: NTao Ma <boyu.mt@taobao.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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