07/12/2020 12:08, wangyunjian:

From: Yunjian Wang <redacted>

Currently, user mem maps will check if the newly mapped area is adjacent
to any existing mapping, but will not check if the mapping is identical
because it assumes that the API will never get called with the same
mapping twice. This will result in duplicate entries in the user mem
maps list.

Fix it by also checking for duplicate mappings, and skipping them if
they are found.

Sorry, that's still difficult to read,
and it is not clear what is the impact of the bug.

+Cc some english native speakers for help.

Fixes: 0cbce3a167f1 ("vfio: skip DMA map failure if already mapped")
Cc: stable@dpdk.org

Signed-off-by: Yunjian Wang <redacted>
Acked-by: Anatoly Burakov <redacted>