From 2fa2fa1ae6b42fc4c4995fdbf8fd7df96bb25ba4 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 24 Jul 2017 12:52:58 +0200
Subject: [PATCH] scsi: bnx2i: Prevent recursive cpuhotplug locking

The BNX2I module init/exit code installs/removes the hotplug callbacks with
the cpu hotplug lock held. This worked with the old CPU locking
implementation which allowed recursive locking, but with the new percpu
rwsem based mechanism this is not longer allowed.

Use the _cpuslocked() variants to fix this.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/scsi/bnx2i/bnx2i_init.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/bnx2i/bnx2i_init.c b/drivers/scsi/bnx2i/bnx2i_init.c
index 86afc002814c..7487b653e799 100644
--- a/drivers/scsi/bnx2i/bnx2i_init.c
+++ b/drivers/scsi/bnx2i/bnx2i_init.c
@@ -516,15 +516,16 @@ static int __init bnx2i_mod_init(void)
 	for_each_online_cpu(cpu)
 		bnx2i_percpu_thread_create(cpu);
 
-	err = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
-				       "scsi/bnx2i:online",
-				       bnx2i_cpu_online, NULL);
+	err = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
+						   "scsi/bnx2i:online",
+						   bnx2i_cpu_online, NULL);
 	if (err < 0)
 		goto remove_threads;
 	bnx2i_online_state = err;
 
-	cpuhp_setup_state_nocalls(CPUHP_SCSI_BNX2I_DEAD, "scsi/bnx2i:dead",
-				  NULL, bnx2i_cpu_dead);
+	cpuhp_setup_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2I_DEAD,
+					     "scsi/bnx2i:dead",
+					     NULL, bnx2i_cpu_dead);
 	put_online_cpus();
 	return 0;
 
@@ -574,8 +575,8 @@ static void __exit bnx2i_mod_exit(void)
 	for_each_online_cpu(cpu)
 		bnx2i_percpu_thread_destroy(cpu);
 
-	cpuhp_remove_state_nocalls(bnx2i_online_state);
-	cpuhp_remove_state_nocalls(CPUHP_SCSI_BNX2I_DEAD);
+	cpuhp_remove_state_nocalls_cpuslocked(bnx2i_online_state);
+	cpuhp_remove_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2I_DEAD);
 	put_online_cpus();
 
 	iscsi_unregister_transport(&bnx2i_iscsi_transport);