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Eric W. Biederman 846f99749a sysfs: Add lockdep annotations for the sysfs active reference ... Holding locks over device_del -> kobject_del -> sysfs_deactivate can cause deadlocks if those same locks are grabbed in sysfs show or store methods. The I model s_active count + completion as a sleeping read/write lock. I describe to lockdep sysfs_get_active as a read_trylock, sysfs_put_active as a read_unlock, and sysfs_deactivate as a write_lock and write_unlock pair. This seems to capture the essence for purposes of finding deadlocks, and in my testing gives finds real issues and ignores non-issues. This brings us back to holding locks over kobject_del is a problem that ideally we should find a way of addressing, but at least lockdep can tell us about the problems instead of requiring developers to debug rare strange system deadlocks, that happen when sysfs files are removed while being written to. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		15 years ago
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Kconfig	fs/Kconfig: move sysfs out	16 years ago
Makefile	…
bin.c	Driver core: bin_attribute parameters can often be const*	15 years ago
dir.c	sysfs: Add lockdep annotations for the sysfs active reference	15 years ago
file.c	sysfs: In sysfs_chmod_file lazily propagate the mode change.	15 years ago
group.c	…
inode.c	sysfs: sysfs_setattr remove unnecessary permission check.	15 years ago
mount.c	sysfs: reference sysfs_dirent from sysfs inodes	16 years ago
symlink.c	sysfs: Implement sysfs_getattr & sysfs_permission	15 years ago
sysfs.h	sysfs: Add lockdep annotations for the sysfs active reference	15 years ago