Dan Williams 557e528255 dax: Introduce alloc_dev_dax_id() ... [ Upstream commit 70aab281e1 ] The reference counting of dax_region objects is needlessly complicated, has lead to confusion [1], and has hidden a bug [2]. Towards cleaning up that mess introduce alloc_dev_dax_id() to minimize the holding of a dax_region reference to only what dev_dax_release() needs, the dax_region->ida. Part of the reason for the mess was the design to dereference a dax_region in all cases in free_dev_dax_id() even if the id was statically assigned by the upper level dax_region driver. Remove the need to call "is_static(dax_region)" by tracking whether the id is dynamic directly in the dev_dax instance itself. With that flag the dax_region pinning and release per dev_dax instance can move to alloc_dev_dax_id() and free_dev_dax_id() respectively. A follow-on cleanup address the unnecessary references in the dax_region setup and drivers. Fixes: 0f3da14a4f ("device-dax: introduce 'seed' devices") Link: http://lore.kernel.org/r/20221203095858.612027-1-liuyongqiang13@huawei.com [1] Link: http://lore.kernel.org/r/3cf0890b-4eb0-e70e-cd9c-2ecc3d496263@hpe.com [2] Reported-by: Yongqiang Liu <liuyongqiang13@huawei.com> Reported-by: Paul Cassella <cassella@hpe.com> Reported-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Link: https://lore.kernel.org/r/168577284563.1672036.13493034988900989554.stgit@dwillia2-xfh.jf.intel.com Reviewed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-07-27 08:44:00 +02:00
..
hmem
pmem
bus.c	dax: Introduce alloc_dev_dax_id()	2023-07-27 08:44:00 +02:00
bus.h
dax-private.h	dax: Introduce alloc_dev_dax_id()	2023-07-27 08:44:00 +02:00
device.c
Kconfig
kmem.c	dax/kmem: Fix leak of memory-hotplug resources	2023-03-11 16:40:04 +01:00
Makefile
super.c