nvme: fix racy access to FDP placement id array

Browse source

nvme_query_fdp_info() is called per-path and therefore prone to races.

It populates head->nr_plids/head->plids for fdp registration.
But nothing protects that pair from concurrent access - two paths scanning
the same namespace can race to populate it.

Avoid the race by moving this initialization work to nvme_alloc_ns_head()
which is called once per shared namespace.

Fixes: 30b5f20bb2 ("nvme: register fdp parameters with the block layer")
Reported-by: Hari Mishal <harimishal1@gmail.com>
Link: https://lore.kernel.org/linux-nvme/20260725135111.14041-2-harimishal1@gmail.com/
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

...

This commit is contained in:

Kanchan Joshi 2026-08-18 11:32:53 +05:30 • committed by Keith Busch

parent c1888444dc

commit 56e1c6bbe4

2 changed files with 12 additions and 19 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

30

drivers/nvme/host/core.c

View file

1

drivers/nvme/host/nvme.h

View file