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PCI: cpci_hotplug: Convert to use the kthread API 

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Scott Murray <scottm@somanetworks.com>
Acked-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Scott Murray 2007-07-09 11:55:57 -07:00 committed by Greg Kroah-Hartman
parent 694625c0b3
commit 0bec2c85bb
1 changed files with 21 additions and 45 deletions
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66
drivers/pci/hotplug/cpci_hotplug_core.c
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@ -35,6 +35,7 @@
#include <linux/smp_lock.h>
#include <asm/atomic.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include "cpci_hotplug.h"
#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
@ -59,9 +60,8 @@ static int slots;
static atomic_t extracting;
int cpci_debug;
static struct cpci_hp_controller *controller;
static struct semaphore event_semaphore; /* mutex for process loop (up if something to process) */
static struct semaphore thread_exit; /* guard ensure thread has exited before calling it quits */
static int thread_finished = 1;
static struct task_struct *cpci_thread;
static int thread_finished;
static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
@ -357,9 +357,7 @@ cpci_hp_intr(int irq, void *data)
controller->ops->disable_irq();
/* Trigger processing by the event thread */
dbg("Signal event_semaphore");
up(&event_semaphore);
dbg("exited cpci_hp_intr");
wake_up_process(cpci_thread);
return IRQ_HANDLED;
}
@ -521,17 +519,12 @@ event_thread(void *data)
{
int rc;
lock_kernel();
daemonize("cpci_hp_eventd");
unlock_kernel();
dbg("%s - event thread started", __FUNCTION__);
while (1) {
dbg("event thread sleeping");
down_interruptible(&event_semaphore);
dbg("event thread woken, thread_finished = %d",
thread_finished);
if (thread_finished || signal_pending(current))
set_current_state(TASK_INTERRUPTIBLE);
schedule();
if (kthread_should_stop())
break;
do {
rc = check_slots();
@ -541,18 +534,17 @@ event_thread(void *data)
} else if (rc < 0) {
dbg("%s - error checking slots", __FUNCTION__);
thread_finished = 1;
break;
goto out;
}
} while (atomic_read(&extracting) && !thread_finished);
if (thread_finished)
} while (atomic_read(&extracting) && !kthread_should_stop());
if (kthread_should_stop())
break;
/* Re-enable ENUM# interrupt */
dbg("%s - re-enabling irq", __FUNCTION__);
controller->ops->enable_irq();
}
dbg("%s - event thread signals exit", __FUNCTION__);
up(&thread_exit);
out:
return 0;
}
@ -562,12 +554,8 @@ poll_thread(void *data)
{
int rc;
lock_kernel();
daemonize("cpci_hp_polld");
unlock_kernel();
while (1) {
if (thread_finished || signal_pending(current))
if (kthread_should_stop() || signal_pending(current))
break;
if (controller->ops->query_enum()) {
do {
@ -578,48 +566,36 @@ poll_thread(void *data)
} else if (rc < 0) {
dbg("%s - error checking slots", __FUNCTION__);
thread_finished = 1;
break;
goto out;
}
} while (atomic_read(&extracting) && !thread_finished);
} while (atomic_read(&extracting) && !kthread_should_stop());
}
msleep(100);
}
dbg("poll thread signals exit");
up(&thread_exit);
out:
return 0;
}
static int
cpci_start_thread(void)
{
int pid;
/* initialize our semaphores */
init_MUTEX_LOCKED(&event_semaphore);
init_MUTEX_LOCKED(&thread_exit);
thread_finished = 0;
if (controller->irq)
pid = kernel_thread(event_thread, NULL, 0);
cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
else
pid = kernel_thread(poll_thread, NULL, 0);
if (pid < 0) {
cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
if (IS_ERR(cpci_thread)) {
err("Can't start up our thread");
return -1;
return PTR_ERR(cpci_thread);
}
dbg("Our thread pid = %d", pid);
thread_finished = 0;
return 0;
}
static void
cpci_stop_thread(void)
{
kthread_stop(cpci_thread);
thread_finished = 1;
dbg("thread finish command given");
if (controller->irq)
up(&event_semaphore);
dbg("wait for thread to exit");
down(&thread_exit);
}
int