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cxl/region: Fix memdev reuse check 

commit f04facfb99 upstream.

Due to a typo, the check of whether or not a memdev has already been
used as a target for the region (above code piece) will always be
skipped. Given a memdev with more than one HDM decoder, an interleaved
region can be created that maps multiple HPAs to the same DPA. According
to CXL spec 3.0 8.1.3.8.4, "Aliasing (mapping more than one Host
Physical Address (HPA) to a single Device Physical Address) is
forbidden."

Fix this by using existing iterator for memdev reuse check.

Cc: <stable@vger.kernel.org>
Fixes: 384e624bb2 ("cxl/region: Attach endpoint decoders")
Signed-off-by: Fan Ni <fan.ni@samsung.com>
Link: https://lore.kernel.org/r/20221107212153.745993-1-fan.ni@samsung.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fan Ni 2022-11-07 21:22:31 +00:00 committed by Greg Kroah-Hartman
parent fab4655990
commit 189c499376
1 changed files with 1 additions and 1 deletions
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2
drivers/cxl/core/region.c
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@ -1226,7 +1226,7 @@ static int cxl_region_attach(struct cxl_region *cxlr,
struct cxl_endpoint_decoder *cxled_target;
struct cxl_memdev *cxlmd_target;
cxled_target = p->targets[pos];
cxled_target = p->targets[i];
if (!cxled_target)
continue;