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Message-ID: <20210104174826.GA76610@home.linuxace.com>
Date: Mon, 4 Jan 2021 09:48:26 -0800
From: Phil Oester <kernel@...uxace.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
Kashyap Desai <kashyap.desai@...adcom.com>,
Sumit Saxena <sumit.saxena@...adcom.com>,
Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Christoph Hellwig <hch@...radead.org>,
"# 3.4.x" <stable@...r.kernel.org>,
Anand Lodnoor <anand.lodnoor@...adcom.com>,
Chandrakanth Patil <chandrakanth.patil@...adcom.com>,
Hannes Reinecke <hare@...e.de>, megaraidlinux.pdl@...adcom.com,
linux-scsi <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] scsi: megaraid_sas: check user-provided offsets
On Sun, Jan 03, 2021 at 05:26:29PM +0100, Arnd Bergmann wrote:
> Thank you for the report and bisecting the issue, and sorry this broke
> your system!
>
> Fortunately, the patch is fairly small, so there are only a limited number
> of things that could go wrong. I haven't tried to analyze that message,
> but I have two ideas:
>
> a) The added ioc->sense_off check gets triggered and the code relies
> on the data being written outside of the structure
>
> b) the address actually needs to always be written as a 64-bit value
> regardless of the instance->consistent_mask_64bit flag, as the
> driver did before. This looked like it was done in error.
>
> Can you try the patch below instead of the revert and see if that
> resolves the regression, and if it triggers the warning message I
> add?
Thanks Arnd, I tried your patch and it resolves the regression. It does not
trigger the warning message you added.
Phil
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