s390/dasd: Snapshot intrc before freeing the request block

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__dasd_cleanup_cqr() maps the completion result to a block status by
reading cqr->intrc, but only after discipline->free_cp() has returned the
request block to its memory pool (dasd_eckd_free_cp() ends in
dasd_sfree_request()). On SMP another CPU can reallocate that block and
overwrite cqr->intrc before it is read, completing the request with the
wrong error. proc_bytes is already snapshotted before free_cp() for the
same reason; do the same for intrc.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20260805111612.1285190-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Stefan Haberland 2026-08-05 13:15:57 +02:00 • committed by Jens Axboe

parent 2a1780f9fc

commit dc3e3f7306

1 changed files with 8 additions and 2 deletions

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drivers/s390/block/dasd.c

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