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Diffstat (limited to 'drivers/media/dvb-core/dvb_ringbuffer.c')
-rw-r--r--drivers/media/dvb-core/dvb_ringbuffer.c26
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 a5712cd..1100e98 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);

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