From: Nilay Shroff <nilay@linux.ibm.com>
To: Zizhi Wo <wozizhi@huaweicloud.com>,
axboe@kernel.dk, dlemoal@kernel.org, kch@nvidia.com,
johannes.thumshirn@wdc.com, kbusch@kernel.org,
bvanassche@acm.org, linux-block@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, yangerkun@huawei.com,
chengzhihao1@huawei.com, wozizhi@huawei.com
Subject: Re: [PATCH V4 5/9] null_blk: free zones array on device power-off
Date: Fri, 10 Jul 2026 19:54:53 +0530 [thread overview]
Message-ID: <c110c8bf-52eb-4f01-b01d-b042178a6002@linux.ibm.com> (raw)
In-Reply-To: <20260709100452.3520482-6-wozizhi@huaweicloud.com>
On 7/9/26 3:34 PM, Zizhi Wo wrote:
> null_init_zoned_dev() allocates dev->zones when a zoned device is powered
> on, but null_del_dev() never frees it on power-off; dev->zones is only
> freed later in null_free_dev(), when the configfs directory is removed. If
> the device is powered off and then on again, null_init_zoned_dev()
> allocates a new array and overwrites the dev->zones pointer, leaking the
> previous allocation each power cycle.
>
> Free dev->zones in null_del_dev() via null_free_zoned_dev() to solve it.
> And calling null_del_dev() in null_free_dev() is no longer necessary
> because every caller already invokes null_del_dev() first: via
> nullb_group_drop_item() before nullb_device_release(), in the
> null_add_dev() error path of null_create_dev(), and in null_destroy_dev().
> Remove the redundant call.
Looks good to me.
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
next prev parent reply other threads:[~2026-07-10 14:25 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 10:04 [PATCH V4 0/9] null_blk: fix init/exit races and memleaks Zizhi Wo
2026-07-09 10:04 ` [PATCH V4 1/9] null_blk: use DEFINE_MUTEX for the file-scope mutex Zizhi Wo
2026-07-10 12:35 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 2/9] null_blk: register configfs subsystem after creating default devices Zizhi Wo
2026-07-10 12:36 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 3/9] null_blk: move unregister_blkdev() after destroying dev in null_exit() Zizhi Wo
2026-07-10 12:36 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 4/9] null_blk: free global tag_set on init error path Zizhi Wo
2026-07-10 12:37 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 5/9] null_blk: free zones array on device power-off Zizhi Wo
2026-07-10 14:24 ` Nilay Shroff [this message]
2026-07-11 0:52 ` Zizhi Wo
2026-07-09 10:04 ` [PATCH V4 6/9] null_blk: clean up null_del_dev() to use cached dev pointer Zizhi Wo
2026-07-10 13:03 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 7/9] null_blk: reject per-device queue resize for shared tag set Zizhi Wo
2026-07-10 12:34 ` Nilay Shroff
2026-07-11 0:13 ` Zizhi Wo
2026-07-09 10:04 ` [PATCH V4 8/9] null_blk: serialize configfs attribute stores with device setup Zizhi Wo
2026-07-10 12:30 ` Nilay Shroff
2026-07-09 10:04 ` [PATCH V4 9/9] null_blk: serialize configfs attribute shows with the file-scope lock Zizhi Wo
2026-07-10 12:31 ` Nilay Shroff
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c110c8bf-52eb-4f01-b01d-b042178a6002@linux.ibm.com \
--to=nilay@linux.ibm.com \
--cc=axboe@kernel.dk \
--cc=bvanassche@acm.org \
--cc=chengzhihao1@huawei.com \
--cc=dlemoal@kernel.org \
--cc=johannes.thumshirn@wdc.com \
--cc=kbusch@kernel.org \
--cc=kch@nvidia.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=wozizhi@huawei.com \
--cc=wozizhi@huaweicloud.com \
--cc=yangerkun@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.