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[media] lirc_dev: remove sampling kthread

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There are no drivers which use this functionality.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
David Härdeman
2017-05-01 13:03:56 -03:00
committed by Mauro Carvalho Chehab
parent 2c5a1f4466
commit c3104e1b42
3 changed files with 2 additions and 109 deletions
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94
drivers/media/rc/lirc_dev.c
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@@ -28,7 +28,6 @@
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/unistd.h>
#include <linux/kthread.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/cdev.h>
@@ -57,9 +56,6 @@ struct irctl {
struct device dev;
struct cdev cdev;
struct task_struct *task;
long jiffies_to_wait;
};
static DEFINE_MUTEX(lirc_dev_lock);
@@ -95,59 +91,6 @@ static void lirc_release(struct device *ld)
kfree(ir);
}
/* helper function
* reads key codes from driver and puts them into buffer
* returns 0 on success
*/
static int lirc_add_to_buf(struct irctl *ir)
{
int res;
int got_data = -1;
if (!ir->d.add_to_buf)
return 0;
/*
* service the device as long as it is returning
* data and we have space
*/
do {
got_data++;
res = ir->d.add_to_buf(ir->d.data, ir->buf);
} while (!res);
if (res == -ENODEV)
kthread_stop(ir->task);
return got_data ? 0 : res;
}
/* main function of the polling thread
*/
static int lirc_thread(void *irctl)
{
struct irctl *ir = irctl;
do {
if (ir->open) {
if (ir->jiffies_to_wait) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(ir->jiffies_to_wait);
}
if (kthread_should_stop())
break;
if (!lirc_add_to_buf(ir))
wake_up_interruptible(&ir->buf->wait_poll);
} else {
set_current_state(TASK_INTERRUPTIBLE);
schedule();
}
} while (!kthread_should_stop());
return 0;
}
static const struct file_operations lirc_dev_fops = {
.owner = THIS_MODULE,
.read = lirc_dev_fop_read,
@@ -252,18 +195,8 @@ static int lirc_allocate_driver(struct lirc_driver *d)
return -EBADRQC;
}
if (d->sample_rate) {
if (2 > d->sample_rate || HZ < d->sample_rate) {
dev_err(d->dev, "invalid %d sample rate\n",
d->sample_rate);
return -EBADRQC;
}
if (!d->add_to_buf) {
dev_err(d->dev, "add_to_buf not set\n");
return -EBADRQC;
}
} else if (!d->rbuf && !(d->fops && d->fops->read &&
d->fops->poll && d->fops->unlocked_ioctl)) {
if (!d->rbuf && !(d->fops && d->fops->read &&
d->fops->poll && d->fops->unlocked_ioctl)) {
dev_err(d->dev, "undefined read, poll, ioctl\n");
return -EBADRQC;
}
@@ -312,22 +245,6 @@ static int lirc_allocate_driver(struct lirc_driver *d)
dev_set_name(&ir->dev, "lirc%d", ir->d.minor);
device_initialize(&ir->dev);
if (d->sample_rate) {
ir->jiffies_to_wait = HZ / d->sample_rate;
/* try to fire up polling thread */
ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev");
if (IS_ERR(ir->task)) {
dev_err(d->dev, "cannot run thread for minor = %d\n",
d->minor);
err = -ECHILD;
goto out_sysfs;
}
} else {
/* it means - wait for external event in task queue */
ir->jiffies_to_wait = 0;
}
err = lirc_cdev_add(ir);
if (err)
goto out_sysfs;
@@ -404,10 +321,6 @@ int lirc_unregister_driver(int minor)
return -ENOENT;
}
/* end up polling thread */
if (ir->task)
kthread_stop(ir->task);
dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n",
ir->d.name, ir->d.minor);
@@ -470,9 +383,6 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
if (ir->buf)
lirc_buffer_clear(ir->buf);
if (ir->task)
wake_up_process(ir->task);
ir->open++;
error: