Staging: comedi: COMEDI_BUFINFO with no async - report no bytes read or written
authorIan Abbott <abbotti@mev.co.uk>
Wed, 19 May 2010 17:09:49 +0000 (18:09 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 4 Jun 2010 20:38:53 +0000 (13:38 -0700)
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 <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/staging/comedi/comedi_fops.c

index 39ed22b802294f6285fdb2ea83cc88ec7c74a51f..75256251250d75cc97858bab1c7575ac5c52119b 100644 (file)
@@ -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;
        }