diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_fops.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index b489d9481a69..452121b6a604 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2210,6 +2210,10 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, retval = -EACCES; goto out; } + if (async->cmd.flags & CMDF_WRITE) { + retval = -EINVAL; + goto out; + } add_wait_queue(&async->wait_head, &wait); while (nbytes > 0 && !retval) { @@ -2249,6 +2253,10 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, retval = -EACCES; break; } + if (async->cmd.flags & CMDF_WRITE) { + retval = -EINVAL; + break; + } continue; } m = copy_to_user(buf, async->prealloc_buf + |