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| author | Jan Kara <jack@suse.cz> | 2022-04-01 13:27:49 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-04-18 04:34:29 +0300 |
| commit | 4e54a2493e582361adc3bfbf06c7d50d19d18837 (patch) | |
| tree | eb83d33e016c6e55c9871aae1ba01e8b82b0f0fc /samples/v4l | |
| parent | 09f871868080c33992cd6a9b72a5ca49582578fa (diff) | |
| download | linux-4e54a2493e582361adc3bfbf06c7d50d19d18837.tar.xz | |
bfq: Get rid of __bio_blkcg() usage
BFQ usage of __bio_blkcg() is a relict from the past. Furthermore if bio
would not be associated with any blkcg, the usage of __bio_blkcg() in
BFQ is prone to races with the task being migrated between cgroups as
__bio_blkcg() calls at different places could return different blkcgs.
Convert BFQ to the new situation where bio->bi_blkg is initialized in
bio_set_dev() and thus practically always valid. This allows us to save
blkcg_gq lookup and noticeably simplify the code.
CC: stable@vger.kernel.org
Fixes: 0fe061b9f03c ("blkcg: fix ref count issue with bio_blkcg() using task_css")
Tested-by: "yukuai (C)" <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220401102752.8599-8-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'samples/v4l')
0 files changed, 0 insertions, 0 deletions