diff options
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index c1fe9e0e46d1..b489d9481a69 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -1451,6 +1451,21 @@ static int __comedi_get_user_cmd(struct comedi_device *dev, return -EINVAL; } + /* + * Set the CMDF_WRITE flag to the correct state if the subdevice + * supports only "read" commands or only "write" commands. + */ + switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { + case SDF_CMD_READ: + cmd->flags &= ~CMDF_WRITE; + break; + case SDF_CMD_WRITE: + cmd->flags |= CMDF_WRITE; + break; + default: + break; + } + return 0; } |