linux-kernel - [PATCH v2 0/4] firewire: core: call address handlers ouside RCU read-side critical section

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Message-ID: <20250803122015.236493-1-o-takashi@sakamocchi.jp>
Date: Sun,  3 Aug 2025 21:20:11 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/4] firewire: core: call address handlers ouside RCU read-side critical section

Hi,

This is an updated version of my previous patchset[1].

In the earlier version, XArray was used to collect FCP address handlers.
However, in typical system, only a few handlers are registered, and
using XArray for this purpose was unnecessarily complex and inefficient.
A simpler and faster approach is more appropriate here.

In this v2 patchset, the kernel stack is used initially to store up to 4
handlers. If more than 4 handlers are registered in the system, a buffer
is dynamically allocated from the kernel heap.

[1] https://lore.kernel.org/lkml/20250728015125.17825-1-o-takashi@sakamocchi.jp/

Takashi Sakamoto (4):
  firewire: core: use reference counting to invoke address handlers
    safely
  firewire: core: call handler for exclusive regions outside RCU
    read-side critical section
  firewire: core: call FCP address handlers outside RCU read-side
    critical section
  firewire: core: reallocate buffer for FCP address handlers when more
    than 4 are registered

 drivers/firewire/core-transaction.c | 91 +++++++++++++++++++++++++----
 include/linux/firewire.h            |  4 ++
 2 files changed, 85 insertions(+), 10 deletions(-)

base-commit: 7061835997daba9e73c723c85bd70bc4c44aef77
-- 
2.48.1