Re: [PATCH 4.9 00/62] 4.9.335-rc1 review

Greg Kroah-Hartman
2022-12-06T11:37:31Z

On Tue, Dec 06, 2022 at 11:23:15AM +0200, Adrian Hunter wrote:
> On 6/12/22 02:11, Florian Fainelli wrote:
> > On 12/5/22 14:48, Florian Fainelli wrote:
> >> On 12/5/22 14:28, Jon Hunter wrote:
> >>> Hi Greg,
> >>>
> >>> On 05/12/2022 19:08, Greg Kroah-Hartman wrote:
> >>>> This is the start of the stable review cycle for the 4.9.335 release.
> >>>> There are 62 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, 07 Dec 2022 19:07:46 +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/v4.x/stable-review/patch-4.9.335-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-4.9.y
> >>>> and the diffstat can be found below.
> >>>>
> >>>> thanks,
> >>>>
> >>>> greg k-h
> >>>>
> >>>> -------------
> >>>> Pseudo-Shortlog of commits:
> >>>>
> >>>> Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> >>>>      Linux 4.9.335-rc1
> >>>>
> >>>> Adrian Hunter <adrian.hunter@intel.com>
> >>>>      mmc: sdhci: Fix voltage switch delay
> >>>
> >>>
> >>> I am seeing a boot regression on a couple boards and bisect is pointing to the above commit.
> >>
> >> Same thing here, getting a hard lock for our devices with the SDHCI controller enabled, sometimes we are lucky to see the following:
> >>
> >> [    4.790367] mmc0: SDHCI controller on 84b0000.sdhci [84b0000.sdhci] using ADMA 64-bit
> >> [   25.802351] INFO: rcu_sched detected stalls on CPUs/tasks:
> >> [   25.807871]  1-...: (1 GPs behind) idle=561/140000000000000/0 softirq=728/728 fqs=5252
> >> [   25.815892]  (detected by 0, t=21017 jiffies, g=61, c=60, q=55)
> >> [   25.821834] Task dump for CPU 1:
> >> [   25.825069] kworker/1:1     R  running task        0   509      2 0x00000002
> >> [   25.832164] Workqueue: events_freezable mmc_rescan
> >> [   25.836974] Backtrace:
> >> [   25.839440] [<ce32fea4>] (0xce32fea4) from [<ce32fed4>] (0xce32fed4)
> >> [   25.845803] Backtrace aborted due to bad frame pointer <cd2f0a54>
> >>
> >> Also confirmed that reverting that change ("mmc: sdhci: Fix voltage switch delay") allows devices to boot properly.
> >>
> >> Had not a chance to test the change when submitted for mainline despite being copied, sorry about that.
> >>
> >> Since that specific commit is also included in the other stable trees (5.4, 5.10, 5.15 and 6.0) I will let you know whether the same issue is present in those trees shortly thereafter.
> >
> > This only appears to impact 4.9, Adrian is there a missing functional dependency for "mmc: sdhci: Fix voltage switch delay" to work correctly on the 4.9 kernel?
>
> The thing that leaps to mind is that "mmc: sdhci: Fix voltage switch delay" returns out of sdhci_set_ios() without releasing the spinlock which was removed in later kernels. I expect below would help, but a revert might allow a more considered response - it is a holiday here today.

I'll just drop them for now from 4.9, thanks!

greg k-h