linux-kernel - [PATCH 0/2] Ensure some device initialization before init task

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Message-Id: <20260122073446.45628-1-yang.yicong@picoheart.com>
Date: Thu, 22 Jan 2026 15:34:44 +0800
From: "Yicong Yang" <yang.yicong@...oheart.com>
To: <rafael@...nel.org>, <lenb@...nel.org>, <tglx@...nel.org>, 
	<gregkh@...uxfoundation.org>, <dakr@...nel.org>
Cc: <akpm@...ux-foundation.org>, <apatel@...tanamicro.com>, <pjw@...nel.org>, 
	<palmer@...belt.com>, <aou@...s.berkeley.edu>, <alex@...ti.fr>, 
	<geshijian@...oheart.com>, <weidong.wd@...oheart.com>, 
	<yang.yicong@...oheart.com>, <linux-acpi@...r.kernel.org>, 
	<linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: [PATCH 0/2] Ensure some device initialization before init task

Fix two issues that may cause devices initialization finished
after entering init task.

Patch 1 ensure the device object scanning by acpi_scan_clear_dep_fn()
is finished before entering init task. Otherwise if some key devices
like console or root device are not ready when entering init task,
the system will panic (no available console) or enter rescure shell
(no root device). It's more possible on RISCV since these devices
are scan and created by acpi_scan_clear_dep_fn() and we've observed
this.

Patch 2 fix a theoretical issue that the console initialization is
still in process by the time we open the console. Since we call
console_on_rootfs() before async_synchronize_full(), there's no
guaranteed for the order.

Thanks Thomas for the discussion to debug these two issues [1].

[1] https://lore.kernel.org/linux-riscv/20260114063730.78009-1-yang.yicong@picoheart.com/

Yicong Yang (2):
  ACPI: scan: Use async schedule function for acpi_scan_clear_dep_fn
  init: Move console_on_rootfs after async_synchronize_full

 drivers/acpi/scan.c | 35 ++++++++++++++++-------------------
 init/main.c         |  4 ++--
 2 files changed, 18 insertions(+), 21 deletions(-)

-- 
2.34.1