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-rw-r--r--drivers/media/dvb/dvb-core/dmxdev.c63
1 files changed, 49 insertions, 14 deletions
diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c
index bbd52be552d..df5bef6a251 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -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: