dm-switch: use WRITE_ONCE() in switch_region_table_write()

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switch_region_table_read() accesses the region table with READ_ONCE()
and is called from the lockless switch_map() IO path. However,
switch_region_table_write() stores to the same array with a plain
assignment. This results in an inconsistent access pattern for a
lockless shared variable and may trigger data race reports.

Use WRITE_ONCE() to pair with the existing READ_ONCE() in
switch_region_table_read().

Cc: stable@vger.kernel.org
Fixes: 99eb1908e6 ("dm switch: factor out switch_region_table_read")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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Haotian Zhang 2026-07-11 22:21:55 +08:00 • committed by Mikulas Patocka

parent 00211ede62

commit c7391ebe33

1 changed files with 1 additions and 1 deletions

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drivers/md/dm-switch.c

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