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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/include
Dennis Zhou 0273ac349f blkcg: handle dying request_queue when associating a blkg
Between v3 [1] and v4 [2] of the blkg association series, the
association point moved from generic_make_request_checks(), which is
called after the request enters the queue, to bio_set_dev(), which is when
the bio is formed before submit_bio(). When the request_queue goes away,
the blkgs supporting the request_queue are destroyed and then the
q->root_blkg is set to %NULL.

This patch adds a %NULL check to blkg_tryget_closest() to prevent the
NPE caused by the above. It also adds a guard to see if the
request_queue is dying when creating a blkg to prevent creating a blkg
for a dead request_queue.

[1] https://lore.kernel.org/lkml/20180911184137.35897-1-dennisszhou@gmail.com/
[2] https://lore.kernel.org/lkml/20181126211946.77067-1-dennis@kernel.org/

Fixes: 5cdf2e3fea ("blkcg: associate blkg when associating a device")
Reported-and-tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-12 17:43:33 -07:00
..
acpi pci-v4.20-changes 2018-10-25 06:50:48 -07:00
asm-generic s390 updates for 4.20-rc2 2018-11-09 06:30:44 -06:00
clocksource
crypto KEYS: asym_tpm: extract key size & public key [ver #2] 2018-10-26 09:30:46 +01:00
drm drm, i915, amdgpu, bridge + core quirk 2018-11-02 10:58:20 -07:00
dt-bindings This time it looks like a quieter release cycle in the clk tree. I guess that's 2018-10-31 11:08:30 -07:00
keys KEYS: Move trusted.h to include/keys [ver #2] 2018-10-26 09:30:47 +01:00
kvm
linux blkcg: handle dying request_queue when associating a blkg 2018-12-12 17:43:33 -07:00
math-emu
media media: Use wait_queue_head_t for media_request 2018-11-20 12:53:23 -05:00
memory
misc
net neighbour: Avoid writing before skb->head in neigh_hh_output() 2018-12-07 16:24:40 -08:00
pcmcia
ras
rdma First merge window pull request 2018-10-26 07:38:19 -07:00
scsi scsi: Fix a harmless double shift bug 2018-12-07 22:27:01 -07:00
soc ARM: SoC driver updates for 4.17 2018-10-29 15:16:01 -07:00
sound ALSA: pcm: Fix interval evaluation with openmin/max 2018-11-29 12:05:19 +01:00
target
trace While rewriting the function graph tracer, I discovered a design flaw that 2018-11-30 09:32:34 -08:00
uapi Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
video
xen Revert "xen/balloon: Mark unallocated host memory as UNUSABLE" 2018-11-29 17:53:31 +01:00