linux-kernel - [PATCH] powerpc/pmac/smp: Add missing FROZEN hotplug notifier transitions

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Date:	Mon,  4 Apr 2016 11:30:01 +0200
From:	Anna-Maria Gleixner <anna-maria@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	rt@...utronix.de, Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/pmac/smp: Add missing FROZEN hotplug notifier transitions

The FROZEN transitions are used when a CPU suspends/resumes. In case
of a suspend/resume, only the up prepare (CPU_UP_PREPARE_FROZEN) is
handled. The error handling transition CPU_UP_CANCELED_FROZEN as well
as the CPU_ONLINE_FROZEN transition are not handled.

Masking the switch case action argument with ~CPU_TASKS_FROZEN, to
handle all FROZEN tasks the same way than the corresponding non frozen
tasks.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
 arch/powerpc/platforms/powermac/smp.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -857,9 +857,8 @@ static int smp_core99_cpu_notify(struct
 {
 	int rc;
 
-	switch(action) {
+	switch(action & ~CPU_TASKS_FROZEN) {
 	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
 		/* Open i2c bus if it was used for tb sync */
 		if (pmac_tb_clock_chip_host) {
 			rc = pmac_i2c_open(pmac_tb_clock_chip_host, 1);