linux-kernel - [PATCH 0/2] EDAC/igen6: Avoid segmentation fault and add polling support

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Message-ID: <20241101204211.414664-1-orange@aiven.io>
Date: Fri,  1 Nov 2024 20:41:12 +0000
From: Orange Kao <orange@...en.io>
To: tony.luck@...el.com,
	qiuxu.zhuo@...el.com
Cc: bp@...en8.de,
	james.morse@....com,
	orange@...sy.org,
	linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	mchehab@...nel.org,
	rric@...nel.org
Subject: [PATCH 0/2] EDAC/igen6: Avoid segmentation fault and add polling support

Hello. This is Orange from Aiven Australia. I want to propose two patches to fix
a bug that affects my machine with Intel N100.

Patch 1: Avoid segmentation fault during rmmod
Patch 2: Add polling support

The detailed reproduce steps has been documented in kernel bugzilla 219360.
Summary below

I have a PC with Intel N100 (with PCI device 8086:461c, DID_ADL_N_SKU4 in
igen6_edac.c) with a BIOS/UEFI that allows me to enable IBECC and error
injection.

Interrupt seems not working in Linux, but it seems able to detect the error when
"modprobe igen6_edac". I am not sure if this is a BIOS bug or not, but I have no
access to BIOS source code. So I tried to implement polling, and it seems to
work. My proposal in patch 2.

Also "rmmod igen6_edac" can trigger segmentation fault. It seems caused by
double kfree on the same memory address. I tried to fix it in patch 1.

Thanks for considering this. I am new to this area so I could be wrong, and I
might need extra help and guidance.