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blkcg: revert blkcg cleanups series

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This reverts a series committed earlier due to null pointer exception
bug report in [1]. It seems there are edge case interactions that I did
not consider and will need some time to understand what causes the
adverse interactions.

The original series can be found in [2] with a follow up series in [3].

[1] https://www.spinics.net/lists/cgroups/msg20719.html
[2] https://lore.kernel.org/lkml/[email protected]/
[3] https://lore.kernel.org/lkml/[email protected]/

This reverts the following commits:
d459d853c2, b2c3fa5467, 101246ec02, b3b9f24f5f, e2b0989954,
f0fcb3ec89, c839e7a03f, bdc2491708, 74b7c02a9b, 5bf9a1f3b4,
a7b39b4e96, 07b05bcc32, 49f4c2dc2b, 27e6fa996c

Signed-off-by: Dennis Zhou <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Dennis Zhou 2018-11-01 17:24:10 -04:00 • committed by Jens Axboe
commit b5f2954d30
22 changed files with 208 additions and 403 deletions
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5
drivers/block/loop.c
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@ -77,7 +77,6 @@
#include <linux/falloc.h>
#include <linux/uio.h>
#include <linux/ioprio.h>
#include <linux/blk-cgroup.h>
#include "loop.h"
@ -1761,8 +1760,8 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
/* always use the first bio's css */
#ifdef CONFIG_BLK_CGROUP
if (cmd->use_aio && rq->bio && rq->bio->bi_blkg) {
cmd->css = &bio_blkcg(rq->bio)->css;
if (cmd->use_aio && rq->bio && rq->bio->bi_css) {
cmd->css = rq->bio->bi_css;
css_get(cmd->css);
} else
#endif