diff options
Diffstat (limited to 'drivers/media/dvb-core/dvb_ringbuffer.c')
| -rw-r--r-- | drivers/media/dvb-core/dvb_ringbuffer.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_ringbuffer.c b/drivers/media/dvb-core/dvb_ringbuffer.c index a5712cd7c65f..1100e98a7b1d 100644 --- a/drivers/media/dvb-core/dvb_ringbuffer.c +++ b/drivers/media/dvb-core/dvb_ringbuffer.c @@ -166,6 +166,31 @@ ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf, size_t return len; } +ssize_t dvb_ringbuffer_write_user(struct dvb_ringbuffer *rbuf, + const u8 __user *buf, size_t len) +{ + int status; + size_t todo = len; + size_t split; + + split = (rbuf->pwrite + len > rbuf->size) ? rbuf->size - rbuf->pwrite : 0; + + if (split > 0) { + status = copy_from_user(rbuf->data+rbuf->pwrite, buf, split); + if (status) + return len - todo; + buf += split; + todo -= split; + rbuf->pwrite = 0; + } + status = copy_from_user(rbuf->data+rbuf->pwrite, buf, todo); + if (status) + return len - todo; + rbuf->pwrite = (rbuf->pwrite + todo) % rbuf->size; + + return len; +} + ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf, size_t len) { int status; @@ -297,3 +322,4 @@ EXPORT_SYMBOL(dvb_ringbuffer_flush_spinlock_wakeup); EXPORT_SYMBOL(dvb_ringbuffer_read_user); EXPORT_SYMBOL(dvb_ringbuffer_read); EXPORT_SYMBOL(dvb_ringbuffer_write); +EXPORT_SYMBOL(dvb_ringbuffer_write_user); |