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[media] lirc_dev: store cdev in irctl, up maxdevs

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Store the cdev pointer in struct irctl, allocated dynamically as needed,
rather than having a static array. At the same time, recycle some of the
saved memory to nudge the maximum number of lirc devices supported up a
ways -- its not that uncommon these days, now that we have the rc-core
lirc bridge driver, to see a system with at least 4 raw IR receivers.
(consider a mythtv backend with several video capture devices and the
possible need for IR transmit hardware).

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jarod Wilson 2011-05-27 16:56:50 -03:00 committed by Mauro Carvalho Chehab
parent 04f561ff87
commit 8de111e276
2 changed files with 28 additions and 11 deletions
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37
drivers/media/rc/lirc_dev.c
View File

@ -55,6 +55,8 @@ struct irctl {
struct lirc_buffer *buf;
unsigned int chunk_size;
struct cdev *cdev;
struct task_struct *task;
long jiffies_to_wait;
};
@ -62,7 +64,6 @@ struct irctl {
static DEFINE_MUTEX(lirc_dev_lock);
static struct irctl *irctls[MAX_IRCTL_DEVICES];
static struct cdev cdevs[MAX_IRCTL_DEVICES];
/* Only used for sysfs but defined to void otherwise */
static struct class *lirc_class;
@ -167,9 +168,13 @@ static struct file_operations lirc_dev_fops = {
static int lirc_cdev_add(struct irctl *ir)
{
int retval;
int retval = -ENOMEM;
struct lirc_driver *d = &ir->d;
struct cdev *cdev = &cdevs[d->minor];
struct cdev *cdev;
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
goto err_out;
if (d->fops) {
cdev_init(cdev, d->fops);
@ -180,12 +185,20 @@ static int lirc_cdev_add(struct irctl *ir)
}
retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor);
if (retval)
return retval;
goto err_out;
retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1);
if (retval)
if (retval) {
kobject_put(&cdev->kobj);
goto err_out;
}
ir->cdev = cdev;
return 0;
err_out:
kfree(cdev);
return retval;
}
@ -214,7 +227,7 @@ int lirc_register_driver(struct lirc_driver *d)
if (MAX_IRCTL_DEVICES <= d->minor) {
dev_err(d->dev, "lirc_dev: lirc_register_driver: "
"\"minor\" must be between 0 and %d (%d)!\n",
MAX_IRCTL_DEVICES-1, d->minor);
MAX_IRCTL_DEVICES - 1, d->minor);
err = -EBADRQC;
goto out;
}
@ -369,7 +382,7 @@ int lirc_unregister_driver(int minor)
if (minor < 0 || minor >= MAX_IRCTL_DEVICES) {
printk(KERN_ERR "lirc_dev: %s: minor (%d) must be between "
"0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES-1);
"0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES - 1);
return -EBADRQC;
}
@ -380,7 +393,7 @@ int lirc_unregister_driver(int minor)
return -ENOENT;
}
cdev = &cdevs[minor];
cdev = ir->cdev;
mutex_lock(&lirc_dev_lock);
@ -410,6 +423,7 @@ int lirc_unregister_driver(int minor)
} else {
lirc_irctl_cleanup(ir);
cdev_del(cdev);
kfree(cdev);
kfree(ir);
irctls[minor] = NULL;
}
@ -453,7 +467,7 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
goto error;
}
cdev = &cdevs[iminor(inode)];
cdev = ir->cdev;
if (try_module_get(cdev->owner)) {
ir->open++;
retval = ir->d.set_use_inc(ir->d.data);
@ -484,13 +498,15 @@ EXPORT_SYMBOL(lirc_dev_fop_open);
int lirc_dev_fop_close(struct inode *inode, struct file *file)
{
struct irctl *ir = irctls[iminor(inode)];
struct cdev *cdev = &cdevs[iminor(inode)];
struct cdev *cdev;
if (!ir) {
printk(KERN_ERR "%s: called with invalid irctl\n", __func__);
return -EINVAL;
}
cdev = ir->cdev;
dev_dbg(ir->d.dev, LOGHEAD "close called\n", ir->d.name, ir->d.minor);
WARN_ON(mutex_lock_killable(&lirc_dev_lock));
@ -503,6 +519,7 @@ int lirc_dev_fop_close(struct inode *inode, struct file *file)
lirc_irctl_cleanup(ir);
cdev_del(cdev);
irctls[ir->d.minor] = NULL;
kfree(cdev);
kfree(ir);
}

2
include/media/lirc_dev.h
View File

@ -9,7 +9,7 @@
#ifndef _LINUX_LIRC_DEV_H
#define _LINUX_LIRC_DEV_H
#define MAX_IRCTL_DEVICES 4
#define MAX_IRCTL_DEVICES 8
#define BUFLEN 16
#define mod(n, div) ((n) % (div))