diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dmxdev.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c index 09e96e9ddbd..04578df3f24 100644 --- a/drivers/media/dvb/dvb-core/dmxdev.c +++ b/drivers/media/dvb/dvb-core/dmxdev.c @@ -141,12 +141,18 @@ static int dvb_dvr_open(struct inode *inode, struct file *file) } if ((file->f_flags & O_ACCMODE) == O_RDONLY) { - void *mem = vmalloc(DVR_BUFFER_SIZE); + void *mem; + if (!dvbdev->readers) { + mutex_unlock(&dmxdev->mutex); + return -EBUSY; + } + mem = vmalloc(DVR_BUFFER_SIZE); if (!mem) { mutex_unlock(&dmxdev->mutex); return -ENOMEM; } dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE); + dvbdev->readers--; } if ((file->f_flags & O_ACCMODE) == O_WRONLY) { @@ -184,6 +190,7 @@ static int dvb_dvr_release(struct inode *inode, struct file *file) dmxdev->dvr_orig_fe); } if ((file->f_flags & O_ACCMODE) == O_RDONLY) { + dvbdev->readers++; if (dmxdev->dvr_buffer.data) { void *mem = dmxdev->dvr_buffer.data; mb(); @@ -1029,8 +1036,7 @@ static struct file_operations dvb_dvr_fops = { static struct dvb_device dvbdev_dvr = { .priv = NULL, - .users = 1, - .writers = 1, + .readers = 1, .fops = &dvb_dvr_fops }; |