linux-kernel - [tip:smp/hotplug] ARM/hw_breakpoint: Fix possible recursive locking for arch_hw_breakpoint

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Date:   Tue, 20 Jun 2017 03:27:59 -0700
From:   tip-bot for Tony Lindgren <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, paulmck@...ux.vnet.ibm.com,
        bigeasy@...utronix.de, linux@...linux.org.uk, rostedt@...dmis.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        mingo@...nel.org, will.deacon@....com, hpa@...or.com,
        peterz@...radead.org, tony@...mide.com
Subject: [tip:smp/hotplug] ARM/hw_breakpoint: Fix possible recursive locking
 for arch_hw_breakpoint_init

Commit-ID:  1b3b22507e0d45dedc6a54b26d56e0b8c4d36875
Gitweb:     http://git.kernel.org/tip/1b3b22507e0d45dedc6a54b26d56e0b8c4d36875
Author:     Tony Lindgren <tony@...mide.com>
AuthorDate: Fri, 16 Jun 2017 01:22:38 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 20 Jun 2017 12:25:22 +0200

ARM/hw_breakpoint: Fix possible recursive locking for arch_hw_breakpoint_init

Recent change to use cpuhp_setup_state_cpuslocked() with commit
fe2a5cd8aa03 ("ARM/hw_breakpoint: Use cpuhp_setup_state_cpuslocked()")
missed to change the related paired cpuhp_remove_state_nocalls_cpuslocked().

Now if arch_hw_breakpoint_init() fails, we get "WARNING: possible recursive
locking detected" on the exit path.

Fixes: fe2a5cd8aa03 ("ARM/hw_breakpoint: Use cpuhp_setup_state_cpuslocked()")
Signed-off-by: Tony Lindgren <tony@...mide.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-omap@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Russell King <linux@...linux.org.uk>
Cc: "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20170616082238.15553-1-tony@atomide.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/arm/kernel/hw_breakpoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index 63cb4c7..af2a7f1 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -1106,7 +1106,7 @@ static int __init arch_hw_breakpoint_init(void)
 		core_num_brps = 0;
 		core_num_wrps = 0;
 		if (ret > 0)
-			cpuhp_remove_state_nocalls(ret);
+			cpuhp_remove_state_nocalls_cpuslocked(ret);
 		cpus_read_unlock();
 		return 0;
 	}