md/raid10: reset read_slot when reusing r10bio for discard

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[ Upstream commit 6b8a26af06 ]

put_all_bios() always drops devs[i].bio, but it only drops
devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an
r10bio that was previously used for a read, read_slot can still be
non-negative, and discard cleanup can skip bio_put() on repl_bio.

Reset read_slot to -1 when preparing an r10bio for discard so the
replacement bio is always released correctly.

Fixes: d30588b273 ("md/raid10: improve raid10 discard request")
Signed-off-by: Chen Cheng <chencheng@fnnas.com>
Reviewed-by: Xiao Ni <xiao@kernel.org>
Link: https://patch.msgid.link/20260515093019.3436882-1-chencheng@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Chen Cheng 2026-05-15 17:30:19 +08:00 • committed by Greg Kroah-Hartman

parent 72fc16ca3d

commit 3cb2a606ce

1 changed files with 1 additions and 0 deletions

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drivers/md/raid10.c

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