redonkable/alistair23-linux
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sony-laptop - remove private workqueue, use keventd instead

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If we reschedule work instead of having work function sleep for 10 msecs
between reads from kfifo we can safely use the main workqueue (keventd)
and not bother with creating driver-private one.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Dmitry Torokhov 2009-12-24 00:02:16 -08:00 committed by Len Brown
parent fcb11235d3
commit 9593bd07ec
1 changed files with 39 additions and 32 deletions
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71
drivers/platform/x86/sony-laptop.c
View file

@ -145,7 +145,6 @@ struct sony_laptop_input_s {
struct input_dev *key_dev;
struct kfifo fifo;
spinlock_t fifo_lock;
struct workqueue_struct *wq;
};
static struct sony_laptop_input_s sony_laptop_input = {
@ -301,18 +300,28 @@ static int sony_laptop_input_keycode_map[] = {
/* release buttons after a short delay if pressed */
static void do_sony_laptop_release_key(struct work_struct *work)
{
struct delayed_work *dwork =
container_of(work, struct delayed_work, work);
struct sony_laptop_keypress kp;
unsigned long flags;
while (kfifo_out_locked(&sony_laptop_input.fifo, (unsigned char *)&kp,
sizeof(kp), &sony_laptop_input.fifo_lock)
== sizeof(kp)) {
msleep(10);
spin_lock_irqsave(&sony_laptop_input.fifo_lock, flags);
if (kfifo_out(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp)) == sizeof(kp)) {
input_report_key(kp.dev, kp.key, 0);
input_sync(kp.dev);
}
/* If there is something in the fifo schedule next release. */
if (kfifo_len(&sony_laptop_input.fifo) != 0)
schedule_delayed_work(dwork, msecs_to_jiffies(10));
spin_unlock_irqrestore(&sony_laptop_input.fifo_lock, flags);
}
static DECLARE_WORK(sony_laptop_release_key_work,
do_sony_laptop_release_key);
static DECLARE_DELAYED_WORK(sony_laptop_release_key_work,
do_sony_laptop_release_key);
/* forward event to the input subsystem */
static void sony_laptop_report_input_event(u8 event)
@ -366,13 +375,13 @@ static void sony_laptop_report_input_event(u8 event)
/* we emit the scancode so we can always remap the key */
input_event(kp.dev, EV_MSC, MSC_SCAN, event);
input_sync(kp.dev);
kfifo_in_locked(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp),
&sony_laptop_input.fifo_lock);
if (!work_pending(&sony_laptop_release_key_work))
queue_work(sony_laptop_input.wq,
&sony_laptop_release_key_work);
/* schedule key release */
kfifo_in_locked(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp),
&sony_laptop_input.fifo_lock);
schedule_delayed_work(&sony_laptop_release_key_work,
msecs_to_jiffies(10));
} else
dprintk("unknown input event %.2x\n", event);
}
@ -390,27 +399,18 @@ static int sony_laptop_setup_input(struct acpi_device *acpi_device)
/* kfifo */
spin_lock_init(&sony_laptop_input.fifo_lock);
error =
kfifo_alloc(&sony_laptop_input.fifo, SONY_LAPTOP_BUF_SIZE, GFP_KERNEL);
error = kfifo_alloc(&sony_laptop_input.fifo,
SONY_LAPTOP_BUF_SIZE, GFP_KERNEL);
if (error) {
printk(KERN_ERR DRV_PFX "kfifo_alloc failed\n");
goto err_dec_users;
}
/* init workqueue */
sony_laptop_input.wq = create_singlethread_workqueue("sony-laptop");
if (!sony_laptop_input.wq) {
printk(KERN_ERR DRV_PFX
"Unable to create workqueue.\n");
error = -ENXIO;
goto err_free_kfifo;
}
/* input keys */
key_dev = input_allocate_device();
if (!key_dev) {
error = -ENOMEM;
goto err_destroy_wq;
goto err_free_kfifo;
}
key_dev->name = "Sony Vaio Keys";
@ -473,9 +473,6 @@ err_unregister_keydev:
err_free_keydev:
input_free_device(key_dev);
err_destroy_wq:
destroy_workqueue(sony_laptop_input.wq);
err_free_kfifo:
kfifo_free(&sony_laptop_input.fifo);
@ -486,12 +483,23 @@ err_dec_users:
static void sony_laptop_remove_input(void)
{
/* cleanup only after the last user has gone */
struct sony_laptop_keypress kp = { NULL };
/* Cleanup only after the last user has gone */
if (!atomic_dec_and_test(&sony_laptop_input.users))
return;
/* flush workqueue first */
flush_workqueue(sony_laptop_input.wq);
cancel_delayed_work_sync(&sony_laptop_release_key_work);
/*
* Generate key-up events for remaining keys. Note that we don't
* need locking since nobody is adding new events to the kfifo.
*/
while (kfifo_out(&sony_laptop_input.fifo,
(unsigned char *)&kp, sizeof(kp)) == sizeof(kp)) {
input_report_key(kp.dev, kp.key, 0);
input_sync(kp.dev);
}
/* destroy input devs */
input_unregister_device(sony_laptop_input.key_dev);
@ -502,7 +510,6 @@ static void sony_laptop_remove_input(void)
sony_laptop_input.jog_dev = NULL;
}
destroy_workqueue(sony_laptop_input.wq);
kfifo_free(&sony_laptop_input.fifo);
}