diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2022-11-04 03:30:30 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-11-05 01:58:35 +0300 |
| commit | 0d9e734018d70cecf79e2e4c6082167160a0f13f (patch) | |
| tree | 0b1b634170cd8b47e5c2034a87c811843ff25ce9 /drivers | |
| parent | a90accb358ae33ea982a35595573f7a045993f8b (diff) | |
| download | linux-0d9e734018d70cecf79e2e4c6082167160a0f13f.tar.xz | |
cxl/region: Fix cxl_region leak, cleanup targets at region delete
When a region is deleted any targets that have been previously assigned
to that region hold references to it. Trigger those references to
drop by detaching all targets at unregister_region() time.
Otherwise that region object will leak as userspace has lost the ability
to detach targets once region sysfs is torn down.
Cc: <stable@vger.kernel.org>
Fixes: b9686e8c8e39 ("cxl/region: Enable the assignment of endpoint decoders to regions")
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Link: https://lore.kernel.org/r/166752183055.947915.17681995648556534844.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cxl/core/region.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index d26ca7a6beae..c52465e09f26 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1557,8 +1557,19 @@ static struct cxl_region *to_cxl_region(struct device *dev) static void unregister_region(void *dev) { struct cxl_region *cxlr = to_cxl_region(dev); + struct cxl_region_params *p = &cxlr->params; + int i; device_del(dev); + + /* + * Now that region sysfs is shutdown, the parameter block is now + * read-only, so no need to hold the region rwsem to access the + * region parameters. + */ + for (i = 0; i < p->interleave_ways; i++) + detach_target(cxlr, i); + cxl_region_iomem_release(cxlr); put_device(dev); } |