Patch "powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type" has been added to the 4.3-stable tree

Patch "powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type" has been added to the 4.3-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type

to the 4.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-powernv-pr_warn_once-on-unsupported-opal_msg-type.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 98da62b716a3b24ab8e77453c9a8a954124c18cd Mon Sep 17 00:00:00 2001
From: Stewart Smith <stewart@linux.vnet.ibm.com>
Date: Fri, 11 Dec 2015 12:08:23 +1100
Subject: powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type

From: Stewart Smith <stewart@linux.vnet.ibm.com>

commit 98da62b716a3b24ab8e77453c9a8a954124c18cd upstream.

When running on newer OPAL firmware that supports sending extra
OPAL_MSG types, we would print a warning on *every* message received.

This could be a problem for kernels that don't support OPAL_MSG_OCC
on machines that are running real close to thermal limits and the
OCC is throttling the chip. For a kernel that is paying attention to
the message queue, we could get these notifications quite often.

Conceivably, future message types could also come fairly often,
and printing that we didn't understand them 10,000 times provides
no further information than printing them once.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/platforms/powernv/opal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -278,7 +278,7 @@ static void opal_handle_message(void)
 
 	/* Sanity check */
 	if (type >= OPAL_MSG_TYPE_MAX) {
-		pr_warning("%s: Unknown message type: %u\n", __func__, type);
+		pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
 		return;
 	}
 	opal_message_do_notify(type, (void *)&msg);


Patches currently in stable-queue which might be from stewart@linux.vnet.ibm.com are

queue-4.3/powerpc-powernv-pr_warn_once-on-unsupported-opal_msg-type.patch