V4L/DVB (12429): v4l2-ioctl: fix G_STD and G_PARM default handlers

The v4l core supplies default handlers for G_STD and G_PARM. However, both
default handlers are buggy.

This patch fixes the following:

1) If no g_std is supplied and current_norm == 0, then this driver does not
   support TV video standards (e.g. a radio or webcam driver). Return
   -EINVAL. This ensures that there is no bogus VIDIOC_G_STD support for
   such drivers.

2) The default VIDIOC_G_PARM handler used current_norm instead of first
   checking if the driver supported g_std and calling that to get the norm.
   It also didn't check if current_norm was 0, since in that case the driver
   does not support TV standards (or no standard was set at all) and the
   default handler should return -EINVAL.

Note that I am very unhappy with these default handlers: I think they
basically behave like some very strange and unexpected side-effect.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index be64a50..f2afc4e 100644 (file)
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -1081,8 +1081,10 @@ static long __video_do_ioctl(struct file *file,
                /* Calls the specific handler */
                if (ops->vidioc_g_std)
                        ret = ops->vidioc_g_std(file, fh, id);
-               else
+               else if (vfd->current_norm)
                        *id = vfd->current_norm;
+               else
+                       ret = -EINVAL;
 
                if (!ret)
                        dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
@@ -1553,12 +1555,19 @@ static long __video_do_ioctl(struct file *file,
                                break;
                        ret = ops->vidioc_g_parm(file, fh, p);
                } else {
+                       v4l2_std_id std = vfd->current_norm;
+
                        if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                                return -EINVAL;
 
-                       v4l2_video_std_frame_period(vfd->current_norm,
-                                                   &p->parm.capture.timeperframe);
                        ret = 0;
+                       if (ops->vidioc_g_std)
+                               ret = ops->vidioc_g_std(file, fh, &std);
+                       else if (std == 0)
+                               ret = -EINVAL;
+                       if (ret == 0)
+                               v4l2_video_std_frame_period(std,
+                                                   &p->parm.capture.timeperframe);
                }
 
                dbgarg(cmd, "type=%d\n", p->type);