This is a note to let you know that I've just added the patch titled block: clear bio->bi_bdev when putting a bio back in the cache to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: block-clear-bio-bi_bdev-when-putting-a-bio-back-in-the-cache.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 11eb695feb636fa5211067189cad25ac073e7fe5 Mon Sep 17 00:00:00 2001 From: Jens Axboe <axboe@xxxxxxxxx> Date: Fri, 24 Feb 2023 09:59:44 -0700 Subject: block: clear bio->bi_bdev when putting a bio back in the cache From: Jens Axboe <axboe@xxxxxxxxx> commit 11eb695feb636fa5211067189cad25ac073e7fe5 upstream. This isn't strictly needed in terms of correctness, but it does allow polling to know if the bio has been put already by a different task and hence avoid polling something that we don't need to. Cc: stable@xxxxxxxxxxxxxxx Fixes: be4d234d7aeb ("bio: add allocation cache abstraction") Reviewed-by: Keith Busch <kbusch@xxxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/bio.c | 1 + 1 file changed, 1 insertion(+) --- a/block/bio.c +++ b/block/bio.c @@ -747,6 +747,7 @@ void bio_put(struct bio *bio) bio_uninit(bio); cache = per_cpu_ptr(bio->bi_pool->cache, get_cpu()); bio->bi_next = cache->free_list; + bio->bi_bdev = NULL; cache->free_list = bio; if (++cache->nr > ALLOC_CACHE_MAX + ALLOC_CACHE_SLACK) bio_alloc_cache_prune(cache, ALLOC_CACHE_SLACK); Patches currently in stable-queue which might be from axboe@xxxxxxxxx are queue-6.1/sbitmap-use-single-per-bitmap-counting-to-wake-up-qu.patch queue-6.1/block-don-t-allow-multiple-bios-for-iocb_nowait-issue.patch queue-6.1/sbitmap-correct-wake_batch-recalculation-to-avoid-po.patch queue-6.1/blk-mq-avoid-sleep-in-blk_mq_alloc_request_hctx.patch queue-6.1/ublk_drv-remove-nr_aborted_queues-from-ublk_device.patch queue-6.1/blk-mq-fix-potential-io-hung-for-shared-sbitmap-per-.patch queue-6.1/blk-mq-wait-on-correct-sbitmap_queue-in-blk_mq_mark_.patch queue-6.1/block-clear-bio-bi_bdev-when-putting-a-bio-back-in-the-cache.patch queue-6.1/ublk_drv-don-t-probe-partitions-if-the-ubq-daemon-is.patch queue-6.1/trace-blktrace-fix-memory-leak-with-using-debugfs_lo.patch queue-6.1/x86-fpu-don-t-set-tif_need_fpu_load-for-pf_io_worker.patch queue-6.1/blk-cgroup-dropping-parent-refcount-after-pd_free_fn.patch queue-6.1/block-be-a-bit-more-careful-in-checking-for-null-bdev-while-polling.patch queue-6.1/block-use-proper-return-value-from-bio_failfast.patch queue-6.1/block-fix-io-statistics-for-cgroup-in-throttle-path.patch queue-6.1/block-ublk-check-io-buffer-based-on-flag-need_get_da.patch queue-6.1/blk-cgroup-synchronize-pd_free_fn-from-blkg_free_wor.patch queue-6.1/sbitmap-remove-redundant-check-in-__sbitmap_queue_ge.patch queue-6.1/block-sync-mixed-merged-request-s-failfast-with-1st-.patch queue-6.1/blk-mq-remove-stale-comment-for-blk_mq_sched_mark_re.patch queue-6.1/blk-iocost-fix-divide-by-0-error-in-calc_lcoefs.patch queue-6.1/s390-dasd-fix-potential-memleak-in-dasd_eckd_init.patch queue-6.1/blk-mq-correct-stale-comment-of-.get_budget.patch queue-6.1/block-bio-integrity-copy-flags-when-bio_integrity_pa.patch