[PATCH] i2c: convert m41t00 to use a workqueue

The m41t00 i2c/rtc driver currently uses a tasklet to schedule
interrupt-level writes to the rtc.  This patch causes the driver
to use a workqueue instead.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/i2c/chips/m41t00.c b/drivers/i2c/chips/m41t00.c
index b5aabe7cf792..27fc9ff2961a 100644
--- a/drivers/i2c/chips/m41t00.c
+++ b/drivers/i2c/chips/m41t00.c
@@ -25,6 +25,7 @@
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/mutex.h>
+#include <linux/workqueue.h>
 
 #include <asm/time.h>
 #include <asm/rtc.h>
@@ -111,7 +112,7 @@ m41t00_get_rtc_time(void)
 }
 
 static void
-m41t00_set_tlet(ulong arg)
+m41t00_set(void *arg)
 {
         struct rtc_time tm;
         ulong   nowtime = *(ulong *)arg;
@@ -145,9 +146,9 @@ m41t00_set_tlet(ulong arg)
         return;
 }
 
-static ulong    new_time;
-
-DECLARE_TASKLET_DISABLED(m41t00_tasklet, m41t00_set_tlet, (ulong)&new_time);
+static ulong new_time;
+static struct workqueue_struct *m41t00_wq;
+static DECLARE_WORK(m41t00_work, m41t00_set, &new_time);
 
 int
 m41t00_set_rtc_time(ulong nowtime)
@@ -155,9 +156,9 @@ m41t00_set_rtc_time(ulong nowtime)
         new_time = nowtime;
 
         if (in_interrupt())
-                tasklet_schedule(&m41t00_tasklet);
+                queue_work(m41t00_wq, &m41t00_work);
         else
-                m41t00_set_tlet((ulong)&new_time);
+                m41t00_set(&new_time);
 
         return 0;
 }
@@ -189,6 +190,7 @@ m41t00_probe(struct i2c_adapter *adap, int addr, int kind)
                 return rc;
         }
 
+        m41t00_wq = create_singlethread_workqueue("m41t00");
         save_client = client;
         return 0;
 }
@@ -206,7 +208,7 @@ m41t00_detach(struct i2c_client *client)
 
         if ((rc = i2c_detach_client(client)) == 0) {
                 kfree(client);
-                tasklet_kill(&m41t00_tasklet);
+                destroy_workqueue(m41t00_wq);
         }
         return rc;
 }