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-rw-r--r--drivers/s390/scsi/zfcp_aux.c4
-rw-r--r--drivers/s390/scsi/zfcp_def.h6
-rw-r--r--drivers/s390/scsi/zfcp_erp.c62
3 files changed, 27 insertions, 45 deletions
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index ed9a8a1..e8f39f0 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -529,7 +529,7 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
goto generic_services_failed;
init_waitqueue_head(&adapter->remove_wq);
- init_waitqueue_head(&adapter->erp_thread_wqh);
+ init_waitqueue_head(&adapter->erp_ready_wq);
init_waitqueue_head(&adapter->erp_done_wqh);
INIT_LIST_HEAD(&adapter->port_list_head);
@@ -541,8 +541,6 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
rwlock_init(&adapter->erp_lock);
rwlock_init(&adapter->abort_lock);
- sema_init(&adapter->erp_ready_sem, 0);
-
INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later);
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 9a8ff05..ce65d88 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -222,8 +222,6 @@ struct zfcp_ls_adisc {
#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
-#define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP 0x00000020
-#define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL 0x00000080
#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
@@ -481,10 +479,9 @@ struct zfcp_adapter {
atomic_t status; /* status of this adapter */
struct list_head erp_ready_head; /* error recovery for this
adapter/devices */
+ wait_queue_head_t erp_ready_wq;
struct list_head erp_running_head;
rwlock_t erp_lock;
- struct semaphore erp_ready_sem;
- wait_queue_head_t erp_thread_wqh;
wait_queue_head_t erp_done_wqh;
struct zfcp_erp_action erp_action; /* pending error recovery */
atomic_t erp_counter;
@@ -492,6 +489,7 @@ struct zfcp_adapter {
actions */
u32 erp_low_mem_count; /* nr of erp actions waiting
for memory */
+ struct task_struct *erp_thread;
struct zfcp_wka_ports *gs; /* generic services */
struct zfcp_dbf *dbf; /* debug traces */
struct zfcp_adapter_mempool pool; /* Adapter memory pools */
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 373567e..577e157 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -9,6 +9,7 @@
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#include <linux/kthread.h>
#include "zfcp_ext.h"
#define ZFCP_MAX_ERPS 3
@@ -75,7 +76,7 @@ static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
list_move(&act->list, &act->adapter->erp_ready_head);
zfcp_dbf_rec_action("erardy1", act);
- up(&adapter->erp_ready_sem);
+ wake_up(&adapter->erp_ready_wq);
zfcp_dbf_rec_thread("erardy2", adapter->dbf);
}
@@ -212,8 +213,7 @@ static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
int retval = 1, need;
struct zfcp_erp_action *act = NULL;
- if (!(atomic_read(&adapter->status) &
- ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
+ if (!adapter->erp_thread)
return -EIO;
need = zfcp_erp_required_act(want, adapter, port, unit);
@@ -226,7 +226,7 @@ static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
goto out;
++adapter->erp_total_count;
list_add_tail(&act->list, &adapter->erp_ready_head);
- up(&adapter->erp_ready_sem);
+ wake_up(&adapter->erp_ready_wq);
zfcp_dbf_rec_thread("eracte1", adapter->dbf);
retval = 0;
out:
@@ -641,7 +641,8 @@ static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
}
zfcp_dbf_rec_thread_lock("erasfx1", adapter->dbf);
- down(&adapter->erp_ready_sem);
+ wait_event(adapter->erp_ready_wq,
+ !list_empty(&adapter->erp_ready_head));
zfcp_dbf_rec_thread_lock("erasfx2", adapter->dbf);
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
break;
@@ -682,7 +683,8 @@ static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
return ZFCP_ERP_FAILED;
zfcp_dbf_rec_thread_lock("erasox1", adapter->dbf);
- down(&adapter->erp_ready_sem);
+ wait_event(adapter->erp_ready_wq,
+ !list_empty(&adapter->erp_ready_head));
zfcp_dbf_rec_thread_lock("erasox2", adapter->dbf);
if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
return ZFCP_ERP_FAILED;
@@ -1285,21 +1287,17 @@ static int zfcp_erp_thread(void *data)
struct list_head *next;
struct zfcp_erp_action *act;
unsigned long flags;
- int ignore;
-
- daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
- /* Block all signals */
- siginitsetinv(&current->blocked, 0);
- atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
- wake_up(&adapter->erp_thread_wqh);
-
- while (!(atomic_read(&adapter->status) &
- ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
+ for (;;) {
zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
- ignore = down_interruptible(&adapter->erp_ready_sem);
+ wait_event_interruptible(adapter->erp_ready_wq,
+ !list_empty(&adapter->erp_ready_head) ||
+ kthread_should_stop());
zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
+ if (kthread_should_stop())
+ break;
+
write_lock_irqsave(&adapter->erp_lock, flags);
next = adapter->erp_ready_head.next;
write_unlock_irqrestore(&adapter->erp_lock, flags);
@@ -1313,9 +1311,6 @@ static int zfcp_erp_thread(void *data)
}
}
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
- wake_up(&adapter->erp_thread_wqh);
-
return 0;
}
@@ -1327,18 +1322,17 @@ static int zfcp_erp_thread(void *data)
*/
int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
{
- int retval;
+ struct task_struct *thread;
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
- retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
- if (retval < 0) {
+ thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
+ dev_name(&adapter->ccw_device->dev));
+ if (IS_ERR(thread)) {
dev_err(&adapter->ccw_device->dev,
"Creating an ERP thread for the FCP device failed.\n");
- return retval;
+ return PTR_ERR(thread);
}
- wait_event(adapter->erp_thread_wqh,
- atomic_read(&adapter->status) &
- ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
+
+ adapter->erp_thread = thread;
return 0;
}
@@ -1353,16 +1347,8 @@ int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
*/
void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
{
- atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
- up(&adapter->erp_ready_sem);
- zfcp_dbf_rec_thread_lock("erthrk1", adapter->dbf);
-
- wait_event(adapter->erp_thread_wqh,
- !(atomic_read(&adapter->status) &
- ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
-
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
- &adapter->status);
+ kthread_stop(adapter->erp_thread);
+ adapter->erp_thread = NULL;
}
/**
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