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scsi: bnx2i: Simplify cpu hotplug code 

The CPU hotplug related code of this driver can be simplified by:

1) Consolidating the callbacks into a single state. The CPU thread can be
   torn down on the CPU which goes offline. There is no point in delaying
   that to the CPU dead state

2) Let the core code invoke the online/offline callbacks and remove the
   extra for_each_online_cpu() loops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Thomas Gleixner 2017-07-24 12:53:00 +02:00 committed by Martin K. Petersen
parent 1937f8a29f
commit f9f22a8691
2 changed files with 15 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/scsi/bnx2i/bnx2i_init.c
View File

@ -404,12 +404,11 @@ int bnx2i_get_stats(void *handle)
/**
* bnx2i_percpu_thread_create - Create a receive thread for an
* online CPU
* bnx2i_cpu_online - Create a receive thread for an online CPU
*
* @cpu: cpu index for the online cpu
*/
static void bnx2i_percpu_thread_create(unsigned int cpu)
static int bnx2i_cpu_online(unsigned int cpu)
{
struct bnx2i_percpu_s *p;
struct task_struct *thread;
@ -419,16 +418,17 @@ static void bnx2i_percpu_thread_create(unsigned int cpu)
thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p,
cpu_to_node(cpu),
"bnx2i_thread/%d", cpu);
if (IS_ERR(thread))
return PTR_ERR(thread);
/* bind thread to the cpu */
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);
p->iothread = thread;
wake_up_process(thread);
}
kthread_bind(thread, cpu);
p->iothread = thread;
wake_up_process(thread);
return 0;
}
static void bnx2i_percpu_thread_destroy(unsigned int cpu)
static int bnx2i_cpu_offline(unsigned int cpu)
{
struct bnx2i_percpu_s *p;
struct task_struct *thread;
@ -451,19 +451,6 @@ static void bnx2i_percpu_thread_destroy(unsigned int cpu)
spin_unlock_bh(&p->p_work_lock);
if (thread)
kthread_stop(thread);
}
static int bnx2i_cpu_online(unsigned int cpu)
{
pr_info("bnx2i: CPU %x online: Create Rx thread\n", cpu);
bnx2i_percpu_thread_create(cpu);
return 0;
}
static int bnx2i_cpu_dead(unsigned int cpu)
{
pr_info("CPU %x offline: Remove Rx thread\n", cpu);
bnx2i_percpu_thread_destroy(cpu);
return 0;
}
@ -511,28 +498,14 @@ static int __init bnx2i_mod_init(void)
p->iothread = NULL;
}
get_online_cpus();
for_each_online_cpu(cpu)
bnx2i_percpu_thread_create(cpu);
err = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
"scsi/bnx2i:online",
bnx2i_cpu_online, NULL);
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "scsi/bnx2i:online",
bnx2i_cpu_online, bnx2i_cpu_offline);
if (err < 0)
goto remove_threads;
goto unreg_driver;
bnx2i_online_state = err;
cpuhp_setup_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2I_DEAD,
"scsi/bnx2i:dead",
NULL, bnx2i_cpu_dead);
put_online_cpus();
return 0;
remove_threads:
for_each_online_cpu(cpu)
bnx2i_percpu_thread_destroy(cpu);
put_online_cpus();
unreg_driver:
cnic_unregister_driver(CNIC_ULP_ISCSI);
unreg_xport:
iscsi_unregister_transport(&bnx2i_iscsi_transport);
@ -552,7 +525,6 @@ static int __init bnx2i_mod_init(void)
static void __exit bnx2i_mod_exit(void)
{
struct bnx2i_hba *hba;
unsigned cpu = 0;
mutex_lock(&bnx2i_dev_lock);
while (!list_empty(&adapter_list)) {
@ -570,14 +542,7 @@ static void __exit bnx2i_mod_exit(void)
}
mutex_unlock(&bnx2i_dev_lock);
get_online_cpus();
for_each_online_cpu(cpu)
bnx2i_percpu_thread_destroy(cpu);
cpuhp_remove_state_nocalls_cpuslocked(bnx2i_online_state);
cpuhp_remove_state_nocalls_cpuslocked(CPUHP_SCSI_BNX2I_DEAD);
put_online_cpus();
cpuhp_remove_state(bnx2i_online_state);
iscsi_unregister_transport(&bnx2i_iscsi_transport);
cnic_unregister_driver(CNIC_ULP_ISCSI);

1
include/linux/cpuhotplug.h
View File

@ -39,7 +39,6 @@ enum cpuhp_state {
CPUHP_PCI_XGENE_DEAD,
CPUHP_IOMMU_INTEL_DEAD,
CPUHP_LUSTRE_CFS_DEAD,
CPUHP_SCSI_BNX2I_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,