linux-kernel - [PATCH] kernel: cpu: send CPU_UP

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Date:   Fri, 14 Jul 2017 14:50:28 -0700
From:   Channagoud Kadabi <ckadabi@...eaurora.org>
To:     gregkh@...uxfoundation.org, tglx@...uxtronix.de
Cc:     Channagoud Kadabi <ckadabi@...eaurora.org>, rusty@...tcorp.com.au,
        tj@...nel.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] kernel: cpu: send CPU_UP_CANCELLED notification

If any of the callbacks during cpu up fail undo_cpu_up calls the
teardown call backs to rollback states but does not send
CPU_UP_CANCELLED. As on 4.9 kernel some drivers still use the
notification mechanism for cpu hotplug we need to send
CPU_UP_CANCELLED notification so drivers can rollback whatever
they did during cpu up.

Signed-off-by: Channagoud Kadabi <ckadabi@...eaurora.org>
---
 kernel/cpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8f52977..ade5bb2 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -494,6 +494,7 @@ static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
 		if (ret) {
 			st->target = prev_state;
 			undo_cpu_up(cpu, st);
+			cpu_notify(CPU_UP_CANCELED, cpu);
 			break;
 		}
 	}
-- 
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