linux-kernel - Re: 2.6.23-rc7-mm1 -- powerpc rtas panic

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Date:	Wed, 3 Oct 2007 10:26:46 +1000
From:	tony@...eyournoodle.com (Tony Breeds)
To:	Linas Vepstas <linas@...tin.ibm.com>
Cc:	Andy Whitcroft <apw@...dowen.org>, linuxppc-dev@...abs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc7-mm1 -- powerpc rtas panic

On Tue, Oct 02, 2007 at 06:28:19PM -0500, Linas Vepstas wrote:
> On Mon, Sep 24, 2007 at 01:35:31PM +0100, Andy Whitcroft wrote:
> > Seeing the following from an older power LPAR, pretty sure we had
> > this in the previous -mm also:
> 
> I haven't forgetten about this ... and am looking at it now.
> Seems that whenever I go to reserve the machine pSeries-102,
> someone else is using it :-)

This panic is caused by "[POWERPC] pseries: Fix jumbled no_logging flag."
(79c0108d1b9db4864ab77b2a95dfa04f2dcf264c), in the powerpc/for-2.6.24
branch.  It looks to me that we have logging enabled too early now.

I think the following is a reasonable fix?

---
Explicitly enable RTAS error logging, when it should be ready.


Signed-off-by: Tony Breeds <tony@...eyournoodle.com>

---

 arch/powerpc/platforms/pseries/rtasd.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/rtasd.c b/arch/powerpc/platforms/pseries/rtasd.c
index 30925d2..0df5d0d 100644
--- a/arch/powerpc/platforms/pseries/rtasd.c
+++ b/arch/powerpc/platforms/pseries/rtasd.c
@@ -54,7 +54,10 @@ static unsigned int rtas_event_scan_rate;
 static int full_rtas_msgs = 0;
 
 /* Stop logging to nvram after first fatal error */
-static int no_more_logging;
+static int no_more_logging = 1; /* Until we initialize everything,
+                                 * make sure we don't try logging
+                                 * anything */
+
 
 static int error_log_cnt;
 
@@ -414,6 +417,8 @@ static int rtasd(void *unused)
 	memset(logdata, 0, rtas_error_log_max);
 	rc = nvram_read_error_log(logdata, rtas_error_log_max,
 	                          &err_type, &error_log_cnt);
+	/* We can use rtas_log_buf now */
+	no_more_logging = 0;
 
 	if (!rc) {
 		if (err_type != ERR_FLAG_ALREADY_LOGGED) {

Yours Tony

  linux.conf.au        http://linux.conf.au/ || http://lca2008.linux.org.au/
  Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!

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