[PATCH 04/15] sysfs: add sysfs_open_file_mutex

Add a separate mutex to protect sysfs_open_dirent->buffers list. This will allow performing sleepable operations while traversing sysfs_buffers, which will be renamed to sysfs_open_file. Note that currently sysfs_open_dirent->buffers list isn't being used for anything and this patch doesn't make

[PATCH 04/15] sysfs: add sysfs_open_file_mutex

Add a separate mutex to protect sysfs_open_dirent-buffers list. This will allow performing sleepable operations while traversing sysfs_buffers, which will be renamed to sysfs_open_file. Note that currently sysfs_open_dirent-buffers list isn't being used for anything and this patch doesn't make