pci: hotplug: cpqphp: convert to kthread infrastructure

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>

1 files changed, 21 insertions, 48 deletions

diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
index dcafa2aaef8a..3ef0a4875a62 100644
--- a/drivers/pci/hotplug/cpqphp_ctrl.c
+++ b/drivers/pci/hotplug/cpqphp_ctrl.c
@@ -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);
 }