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V4L/DVB (7659): dvb-core: Implement DMX_SET_BUFFER_SIZE for dvr 

Implementation of DMX_SET_BUFFER_SIZE for dvr.
Synchronization of the code of DMX_SET_BUFFER_SIZE for demux and dvr.

Signed-off-by: Andrea Odetti <mariofutire@gmail.com>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Andrea Odetti 2008-04-20 19:14:51 -03:00 committed by Mauro Carvalho Chehab
parent 48c01a9c2d
commit a095be4b03
1 changed files with 49 additions and 14 deletions
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63
drivers/media/dvb/dvb-core/dmxdev.c
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@ -259,6 +259,39 @@ static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
return ret;
}
static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
unsigned long size)
{
struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
void *newmem;
void *oldmem;
dprintk("function : %s\n", __func__);
if (buf->size == size)
return 0;
if (!size)
return -EINVAL;
newmem = vmalloc(size);
if (!newmem)
return -ENOMEM;
oldmem = buf->data;
spin_lock_irq(&dmxdev->lock);
buf->data = newmem;
buf->size = size;
/* reset and not flush in case the buffer shrinks */
dvb_ringbuffer_reset(buf);
spin_unlock_irq(&dmxdev->lock);
vfree(oldmem);
return 0;
}
static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
*dmxdevfilter, int state)
{
@ -271,30 +304,32 @@ static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
unsigned long size)
{
struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
void *mem;
void *newmem;
void *oldmem;
if (buf->size == size)
return 0;
if (!size)
return -EINVAL;
if (dmxdevfilter->state >= DMXDEV_STATE_GO)
return -EBUSY;
newmem = vmalloc(size);
if (!newmem)
return -ENOMEM;
oldmem = buf->data;
spin_lock_irq(&dmxdevfilter->dev->lock);
mem = buf->data;
buf->data = NULL;
buf->data = newmem;
buf->size = size;
/* reset and not flush in case the buffer shrinks */
dvb_ringbuffer_reset(buf);
spin_unlock_irq(&dmxdevfilter->dev->lock);
vfree(mem);
if (buf->size) {
mem = vmalloc(dmxdevfilter->buffer.size);
if (!mem)
return -ENOMEM;
spin_lock_irq(&dmxdevfilter->dev->lock);
buf->data = mem;
spin_unlock_irq(&dmxdevfilter->dev->lock);
}
vfree(oldmem);
return 0;
}
@ -1011,6 +1046,7 @@ static int dvb_dvr_do_ioctl(struct inode *inode, struct file *file,
{
struct dvb_device *dvbdev = file->private_data;
struct dmxdev *dmxdev = dvbdev->priv;
unsigned long arg = (unsigned long)parg;
int ret;
if (mutex_lock_interruptible(&dmxdev->mutex))
@ -1018,8 +1054,7 @@ static int dvb_dvr_do_ioctl(struct inode *inode, struct file *file,
switch (cmd) {
case DMX_SET_BUFFER_SIZE:
// FIXME: implement
ret = 0;
ret = dvb_dvr_set_buffer_size(dmxdev, arg);
break;
default: