linux-kernel - Re: [PATCH 5.10 000/139] 5.10.168-rc1 review

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Date:   Tue, 14 Feb 2023 14:53:13 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>, stable@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        sudipm.mukherjee@...il.com, srw@...dewatkins.net, rwarsow@....de
Subject: Re: [PATCH 5.10 000/139] 5.10.168-rc1 review

On Tue, Feb 14, 2023 at 07:20:46AM +0100, Greg Kroah-Hartman wrote:
> On Mon, Feb 13, 2023 at 11:50:24AM -0800, Florian Fainelli wrote:
> > On 2/13/23 06:49, Greg Kroah-Hartman wrote:
> > > This is the start of the stable review cycle for the 5.10.168 release.
> > > There are 139 patches in this series, all will be posted as a response
> > > to this one.  If anyone has any issues with these being applied, please
> > > let me know.
> > > 
> > > Responses should be made by Wed, 15 Feb 2023 14:46:51 +0000.
> > > Anything received after that time might be too late.
> > > 
> > > The whole patch series can be found in one patch at:
> > > 	https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.10.168-rc1.gz
> > > or in the git tree and branch at:
> > > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
> > > and the diffstat can be found below.
> > > 
> > > thanks,
> > > 
> > > greg k-h
> > 
> > There is a regression coming from:
> > 
> > nvmem: core: fix registration vs use race
> > 
> > which causes the following to happen for MTD devices:
> > 
> > [    6.031640] kobject_add_internal failed for mtd0 with -EEXIST, don't try
> > to register things with the same name in the same directory.
> > [    7.846965] spi-nor: probe of spi0.0 failed with error -17
> > 
> > attached is a full log with the call trace. This does not happen with
> > v6.2-rc8 where the MTD partitions are successfully registered.
> 
> Can you use `git bisect` to find the offending commit?

The reason for this is because, due to how my patch series was
backported, you have ended up with nvmem_register() initialising
its embedded device, and then calling device_add() on it _twice_.

Basically, the backport of:

	"nvmem: core: fix registration vs use race"

is broken, because the original patch _moved_ the device_add() and
that has not been carried forward to whatever got applied to stable
trees.

It looks like the 5.15-stable version of this patch was correct.

Maybe whoever tried to fixup the failure needs to try again?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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