linux-kernel - [PATCH 0/3] sysfs: Group visibility fixups

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Date: Thu, 22 Feb 2024 12:40:48 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: gregkh@...uxfoundation.org
Cc: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
 Marc Herbert <marc.herbert@...el.com>, "Rafael J. Wysocki" <rafael@...nel.org>,
 linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
 linux-coco@...ts.linux.dev, alsa-devel@...a-project.org
Subject: [PATCH 0/3] sysfs: Group visibility fixups

Hey Greg,

Marc was able to get me a backtrace for that bootup hang scenario that
Pierre noted here [1]. A Tested-by is still pending, but I am certain
this is the issue, and it may impact more than just the one platform if
that "empty_attrs" pattern has been repeated anywhere else in the
kernel.

I also took some time to document how to use the helpers a bit better,
and introduce DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE() for cases where all
that matters is group visibility and not per attribute visibility.

[1]: http://lore.kernel.org/r/b93ec9c2-23f5-486b-a3dc-ed9b960df359@linux.intel.com

---

Dan Williams (3):
      sysfs: Fix crash on empty group attributes array
      sysfs: Document new "group visible" helpers
      sysfs: Introduce DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE()

 fs/sysfs/group.c      |    4 +-
 include/linux/sysfs.h |   85 +++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 84 insertions(+), 5 deletions(-)

base-commit: 70317fd24b419091aa0a6dc3ea3ec7bb50c37c32