On Mar 02, 2024 / 10:28, Shin'ichiro Kawasaki wrote:
> The commit 5913320eb0b3 ("platform/x86: p2sb: Allow p2sb_bar() calls
> during PCI device probe") triggered repeated ACPI errors on ASUS
> VivoBook D540NV-GQ065T [1]. It was confirmed that the P2SB device scan
> and remove at the fs_initcall stage triggered the errors.
>
> To avoid the error, defer the P2SB device scan on the concerned device.
> The error was observed on the system with Pentium N4200 in Goldmont micro-
> architecture, and on which P2SB has function 0. Then refer to the P2SB
> function to decide whether to defer or not.
>
> When the device scan is deferred, do the scan later when p2sb_bar() is
> called for the first time. If this first scan is triggered by sysfs
> pci bus rescan, deadlock happens. In most cases, the scan happens during
> system boot process, then there is no chance of deadlock.
>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218531 [1]
> Fixes: 5913320eb0b3 ("platform/x86: p2sb: Allow p2sb_bar() calls during PCI device probe")
> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Let me drop this patch. danilrybakov found that the ACPI errors are still
reported even with this patch. Will try another fix approach.
