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Ming Lei c6b7a3a26e blk-mq: fix two misuses on RQF_USE_SCHED 
Request allocated from sched tags can't be issued via ->queue_rqs()
directly, since driver tag isn't allocated yet. This is the 1st misuse
of RQF_USE_SCHED for figuring out plug->has_elevator.

Request allocated from sched tags can't be ended by
blk_mq_end_request_batch() too, fix the 2nd RQF_USE_SCHED misuse
in blk_mq_add_to_batch().

Without this patch, NVMe uring cmd passthrough IO workload can run into
hang easily with real io scheduler.

Fixes: dd6216bb16 ("blk-mq: make sure elevator callbacks aren't called for passthrough request")
Reported-by: Guangwu Zhang <guazhang@redhat.com>
Closes: https://lore.kernel.org/linux-block/CAGS2=YrBjpLPOKa-gzcKuuOG60AGth5794PNCDwatdnnscB9ug@mail.gmail.com/
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230624130105.1443879-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2023-06-25 08:01:05 -06:00
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acpi
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asm-generic Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
clocksource
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crypto
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drm Merge tag 'drm-misc-fixes-2023-05-11' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes 2023-05-12 05:32:36 +10:00
dt-bindings - mailbox api: allow direct registration to a channel 2023-05-07 10:17:33 -07:00
keys
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kunit
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kvm s390: 2023-05-01 12:06:20 -07:00
linux blk-mq: fix two misuses on RQF_USE_SCHED 2023-06-25 08:01:05 -06:00
math-emu
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media
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memory
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misc
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net bonding: fix send_peer_notif overflow 2023-05-10 09:27:20 +01:00
pcmcia
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ras
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rdma
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rv
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scsi scsi: replace the fmode_t argument to scsi_ioctl with a simple bool 2023-06-12 08:04:04 -06:00
soc Nothing looks out of the ordinary in this batch of clk driver updates. There 2023-04-29 17:29:39 -07:00
sound
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target
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trace block: introduce block_io_start/block_io_done tracepoints 2023-05-24 08:38:59 -06:00
uapi block: change all __u32 annotations to __be32 in affs_hardblocks.h 2023-06-20 14:28:17 -06:00
ufs SCSI misc on 20230426 2023-04-26 15:39:25 -07:00
vdso
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video
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xen
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