linux-kernel - [PATCH] windfarm: decrement client count when unregistering

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Date:	Fri, 31 Jul 2015 14:08:58 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] windfarm: decrement client count when unregistering

wf_unregister_client() increments the client count when a client
unregisters. That is obviously incorrect. Decrement that client count
instead.

Fixes: 75722d3992f5 ("[PATCH] ppc64: Thermal control for SMU based machines")

Signed-off-by: Paul Bolle <pebolle@...cali.nl>
---
cross-compiled only. I don't have a PPC machine at hand, sorry. And this
does need some run-time testing, I'd day.

windfarm_corex_exit() contains:
    BUG_ON(wf_client_count != 0);

I wonder why that, apparently. never triggered.

 drivers/macintosh/windfarm_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/macintosh/windfarm_core.c
b/drivers/macintosh/windfarm_core.c
index 3ee198b65843..cc7ece1712b5 100644
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -435,7 +435,7 @@ int wf_unregister_client(struct notifier_block *nb)
 {
 	mutex_lock(&wf_lock);
 	blocking_notifier_chain_unregister(&wf_client_list, nb);
-	wf_client_count++;
+	wf_client_count--;
 	if (wf_client_count == 0)
 		wf_stop_thread();
 	mutex_unlock(&wf_lock);
-- 
2.4.3
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