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scsi: bnx2fc: Prevent recursive cpuhotplug locking 

The BNX2FC 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: kernel test robot <fengguang.wu@intel.com>
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>
This commit is contained in:
Thomas Gleixner 2017-07-24 12:52:57 +02:00 committed by Martin K. Petersen
parent 8addebc14a
commit 2c2b66ae9d
1 changed files with 8 additions and 7 deletions
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15
drivers/scsi/bnx2fc/bnx2fc_fcoe.c
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@ -2766,15 +2766,16 @@ static int __init bnx2fc_mod_init(void)
for_each_online_cpu(cpu)
bnx2fc_percpu_thread_create(cpu);
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"scsi/bnx2fc:online",
bnx2fc_cpu_online, NULL);
rc = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
"scsi/bnx2fc:online",
bnx2fc_cpu_online, NULL);
if (rc < 0)
goto stop_threads;
bnx2fc_online_state = rc;
cpuhp_setup_state_nocalls(CPUHP_SCSI_BNX2FC_DEAD, "scsi/bnx2fc:dead",
NULL, bnx2fc_cpu_dead);
cpuhp_setup_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2FC_DEAD,
"scsi/bnx2fc:dead",
NULL, bnx2fc_cpu_dead);
put_online_cpus();
cnic_register_driver(CNIC_ULP_FCOE, &bnx2fc_cnic_cb);
@ -2850,8 +2851,8 @@ static void __exit bnx2fc_mod_exit(void)
bnx2fc_percpu_thread_destroy(cpu);
}
cpuhp_remove_state_nocalls(bnx2fc_online_state);
cpuhp_remove_state_nocalls(CPUHP_SCSI_BNX2FC_DEAD);
cpuhp_remove_state_nocalls_cpuslocked(bnx2fc_online_state);
cpuhp_remove_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2FC_DEAD);
put_online_cpus();