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[PATCH] i2c: convert ds1374 to use a workqueue 

A tasklet is not suitable for what the ds1374 driver does: neither sleeping
nor mutex operations are allowed in tasklets, and ds1374_set_tlet may do
both.

We can use a workqueue instead, where both sleeping and mutex operations
are allowed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Randy Vinson <rvinson@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jean Delvare 2006-03-31 23:05:01 +02:00 committed by Greg Kroah-Hartman
parent f043ca43c1
commit 524465df2a
1 changed files with 10 additions and 6 deletions
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16
drivers/i2c/chips/ds1374.c
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@ -27,6 +27,7 @@
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#define DS1374_REG_TOD0 0x00
#define DS1374_REG_TOD1 0x01
@ -139,7 +140,7 @@ ulong ds1374_get_rtc_time(void)
return t1;
}
static void ds1374_set_tlet(ulong arg)
static void ds1374_set_work(void *arg)
{
ulong t1, t2;
int limit = 10; /* arbitrary retry limit */
@ -168,17 +169,18 @@ static void ds1374_set_tlet(ulong arg)
static ulong new_time;
static DECLARE_TASKLET_DISABLED(ds1374_tasklet, ds1374_set_tlet,
(ulong) & new_time);
static struct workqueue_struct *ds1374_workqueue;
static DECLARE_WORK(ds1374_work, ds1374_set_work, &new_time);
int ds1374_set_rtc_time(ulong nowtime)
{
new_time = nowtime;
if (in_interrupt())
tasklet_schedule(&ds1374_tasklet);
queue_work(ds1374_workqueue, &ds1374_work);
else
ds1374_set_tlet((ulong) & new_time);
ds1374_set_work(&new_time);
return 0;
}
@ -204,6 +206,8 @@ static int ds1374_probe(struct i2c_adapter *adap, int addr, int kind)
client->adapter = adap;
client->driver = &ds1374_driver;
ds1374_workqueue = create_singlethread_workqueue("ds1374");
if ((rc = i2c_attach_client(client)) != 0) {
kfree(client);
return rc;
@ -227,7 +231,7 @@ static int ds1374_detach(struct i2c_client *client)
if ((rc = i2c_detach_client(client)) == 0) {
kfree(i2c_get_clientdata(client));
tasklet_kill(&ds1374_tasklet);
destroy_workqueue(ds1374_workqueue);
}
return rc;
}