Staging: comedi: COMEDI_BUFINFO with no async - report no bytes read or written

When the COMEDI_BUFINFO ioctl is used on a subdevice without
asynchronous streaming command support, set 'bytes_read = 0' and
'bytes_written = 0' in the buffer info returned back to the user.

Signed-off-by: Ian Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 39ed22b802294f6285fdb2ea83cc88ec7c74a51f..75256251250d75cc97858bab1c7575ac5c52119b 100644 (file)
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -584,6 +584,8 @@ static int do_bufinfo_ioctl(struct comedi_device *dev,
                bi.buf_read_ptr = 0;
                bi.buf_write_count = 0;
                bi.buf_read_count = 0;
+               bi.bytes_read = 0;
+               bi.bytes_written = 0;
                goto copyback;
        }