linux-kernel - Re: [PATCH] f2fs: handle decompress only post processing in softirq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACOAw_xZvvJFC8OwDQibtXqyYS7bMRe8CVkkktT_Nd1_EtFw+g@mail.gmail.com>
Date:   Tue, 14 Jun 2022 09:33:45 -0700
From:   Daeho Jeong <daeho43@...il.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>,
        Nathan Huckleberry <nhuck@...gle.com>
Subject: Re: [PATCH] f2fs: handle decompress only post processing in softirq

> One question: is this (the bio endio callback) actually guaranteed to be
> executed from a softirq?  If you look at dm-crypt's support for workqueue-less
> decryption, for example, it explicitly checks 'in_hardirq() || irqs_disabled()'
> and schedules a tasklet if either of those is the case.
>
> - Eric

Oh, you're right. Even though it's safe to defer all the release
process as a work in end_io function, it's better to check the
condition and process the release process right away if possible.

Thanks,