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pci: hotplug: cpqphp: convert to kthread infrastructure

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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Christoph Hellwig 2007-08-14 16:17:15 -07:00 committed by Greg Kroah-Hartman
parent 2d100fe8f6
commit fa007d8beb
1 changed files with 21 additions and 48 deletions
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69
drivers/pci/hotplug/cpqphp_ctrl.c
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@ -37,6 +37,7 @@
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/kthread.h>
#include "cpqphp.h"
static u32 configure_new_device(struct controller* ctrl, struct pci_func *func,
@ -45,34 +46,20 @@ static int configure_new_function(struct controller* ctrl, struct pci_func *func
u8 behind_bridge, struct resource_lists *resources);
static void interrupt_event_handler(struct controller *ctrl);
static struct semaphore event_semaphore; /* mutex for process loop (up if something to process) */
static struct semaphore event_exit; /* guard ensure thread has exited before calling it quits */
static int event_finished;
static unsigned long pushbutton_pending; /* = 0 */
/* things needed for the long_delay function */
static struct semaphore delay_sem;
static wait_queue_head_t delay_wait;
static struct task_struct *cpqhp_event_thread;
static unsigned long pushbutton_pending; /* = 0 */
/* delay is in jiffies to wait for */
static void long_delay(int delay)
{
DECLARE_WAITQUEUE(wait, current);
/* only allow 1 customer into the delay queue at once
* yes this makes some people wait even longer, but who really cares?
* this is for _huge_ delays to make the hardware happy as the
* signals bounce around
/*
* XXX(hch): if someone is bored please convert all callers
* to call msleep_interruptible directly. They really want
* to specify timeouts in natural units and spend a lot of
* effort converting them to jiffies..
*/
down (&delay_sem);
init_waitqueue_head(&delay_wait);
add_wait_queue(&delay_wait, &wait);
msleep_interruptible(jiffies_to_msecs(delay));
remove_wait_queue(&delay_wait, &wait);
up(&delay_sem);
}
@ -955,8 +942,8 @@ irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data)
}
if (schedule_flag) {
up(&event_semaphore);
dbg("Signal event_semaphore\n");
wake_up_process(cpqhp_event_thread);
dbg("Waking even thread");
}
return IRQ_HANDLED;
}
@ -1735,7 +1722,7 @@ static u32 remove_board(struct pci_func * func, u32 replace_flag, struct control
static void pushbutton_helper_thread(unsigned long data)
{
pushbutton_pending = data;
up(&event_semaphore);
wake_up_process(cpqhp_event_thread);
}
@ -1744,13 +1731,13 @@ static int event_thread(void* data)
{
struct controller *ctrl;
daemonize("phpd_event");
while (1) {
dbg("!!!!event_thread sleeping\n");
down_interruptible (&event_semaphore);
dbg("event_thread woken finished = %d\n", event_finished);
if (event_finished) break;
set_current_state(TASK_INTERRUPTIBLE);
schedule();
if (kthread_should_stop())
break;
/* Do stuff here */
if (pushbutton_pending)
cpqhp_pushbutton_thread(pushbutton_pending);
@ -1759,38 +1746,24 @@ static int event_thread(void* data)
interrupt_event_handler(ctrl);
}
dbg("event_thread signals exit\n");
up(&event_exit);
return 0;
}
int cpqhp_event_start_thread(void)
{
int pid;
/* initialize our semaphores */
init_MUTEX(&delay_sem);
init_MUTEX_LOCKED(&event_semaphore);
init_MUTEX_LOCKED(&event_exit);
event_finished=0;
pid = kernel_thread(event_thread, NULL, 0);
if (pid < 0) {
cpqhp_event_thread = kthread_run(event_thread, NULL, "phpd_event");
if (IS_ERR(cpqhp_event_thread)) {
err ("Can't start up our event thread\n");
return -1;
return PTR_ERR(cpqhp_event_thread);
}
dbg("Our event thread pid = %d\n", pid);
return 0;
}
void cpqhp_event_stop_thread(void)
{
event_finished = 1;
dbg("event_thread finish command given\n");
up(&event_semaphore);
dbg("wait for event_thread to exit\n");
down(&event_exit);
kthread_stop(cpqhp_event_thread);
}