From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Mahesh J Salgaonkar <mahesh@linux.vnet.ibm.com>,
linuxppc-dev <linuxppc-dev@ozlabs.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Subject: Re: [PATCH] powerpc/hmi: Fix kernel hang when TB is in error state.
Date: Fri, 3 May 2019 16:59:06 +1000 (AEST) [thread overview]
Message-ID: <44wNK66JHGz9sDn@ozlabs.org> (raw)
In-Reply-To: <155172853902.20037.16712960724031791025.stgit@jupiter>
On Mon, 2019-03-04 at 19:42:19 UTC, Mahesh J Salgaonkar wrote:
> From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
>
> On TOD/TB errors timebase register stops/freezes until HMI error recovery
> gets TOD/TB back into running state. On successful recovery, TB starts
> running again and udelay() that relies on TB value continues to function
> properly. But in case when HMI fails to recover from TOD/TB errors, the
> TB register stay freezed. With TB not running the __delay() function
> keeps looping and never return. If __delay() is called while in panic
> path then system hangs and never reboots after panic.
>
> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/de269129a48a2d590ba1d20c719e19d8
cheers
prev parent reply other threads:[~2019-05-03 7:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-04 19:42 [PATCH] powerpc/hmi: Fix kernel hang when TB is in error state Mahesh J Salgaonkar
2019-05-03 6:59 ` Michael Ellerman [this message]
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