linux-kernel - Re: [PATCH v2] ubi: gluebi: Fix NULL pointer dereference caused by ftl notifier

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Date: Mon, 17 Jun 2024 17:42:50 +0200 (CEST)
From: Richard Weinberger <richard@....at>
To: Gagan Sidhu <broly@....com>
Cc: ZhaoLong Wang <wangzhaolong1@...wei.com>, 
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>, 
	chengzhihao1 <chengzhihao1@...wei.com>, 
	dpervushin <dpervushin@...eddedalley.com>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-mtd <linux-mtd@...ts.infradead.org>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, 
	Vignesh Raghavendra <vigneshr@...com>, 
	yangerkun <yangerkun@...wei.com>, yi zhang <yi.zhang@...wei.com>
Subject: Re: [PATCH v2] ubi: gluebi: Fix NULL pointer dereference caused by
 ftl notifier

----- Ursprüngliche Mail -----
> Von: "Gagan Sidhu" <broly@....com>
> typically what happens is we will wrap a squashfs filesystem inside a UBI layer.
> openwrt people call this “ubinising” the root filesystem.
> 
> then, after we label the appropriate nand partitions as ‘uimage,fw’ to call the
> right mtdsplit, the mtd_ubi subsystem works its magic automatically, as long as
> the root partition is named “rootfs”.
> 
> at that point, the rootfs will be *AUTOMATICALLY* mounted AND booted from BY THE
> KERNEL. that is, no cmdline hacks are required.
> 
> this patch breaks that behaviour since mr wang’s additional conditions result in
> the failure of the partition to get added to the mtd list, and thus fails
> mount.
> 

Please help me understanding the layering.
So, you have sqaushfs inside an UBI volume and create a UBI block device from that?
And you have enabled gluebi to have the said UBI volume as MTD (and thus as mtdblock too)?

Thanks,
//richard