[media] tuner-core.c: don't change type field in g_tuner or g_frequency

The tuner core should not silently change the type field in g_tuner and
g_frequency. If the tuner is in a different mode than the one that was
requested, then just fill in what you can and don't attempt to read afc,
signal or rxsubchans values.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index 39af999..cfa9f7e 100644 (file)
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -1101,8 +1101,7 @@ static int tuner_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
 
        if (check_mode(t, f->type) == -EINVAL)
                return 0;
-       f->type = t->mode;
-       if (fe_tuner_ops->get_frequency && !t->standby) {
+       if (f->type == t->mode && fe_tuner_ops->get_frequency && !t->standby) {
                u32 abs_freq;
 
                fe_tuner_ops->get_frequency(&t->fe, &abs_freq);
@@ -1110,7 +1109,7 @@ static int tuner_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
                        DIV_ROUND_CLOSEST(abs_freq * 2, 125) :
                        DIV_ROUND_CLOSEST(abs_freq, 62500);
        } else {
-               f->frequency = (V4L2_TUNER_RADIO == t->mode) ?
+               f->frequency = (V4L2_TUNER_RADIO == f->type) ?
                        t->radio_freq : t->tv_freq;
        }
        return 0;
@@ -1134,32 +1133,33 @@ static int tuner_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 
        if (check_mode(t, vt->type) == -EINVAL)
                return 0;
-       vt->type = t->mode;
-       if (analog_ops->get_afc)
+       if (vt->type == t->mode && analog_ops->get_afc)
                vt->afc = analog_ops->get_afc(&t->fe);
-       if (t->mode == V4L2_TUNER_ANALOG_TV)
+       if (vt->type == V4L2_TUNER_ANALOG_TV)
                vt->capability |= V4L2_TUNER_CAP_NORM;
-       if (t->mode != V4L2_TUNER_RADIO) {
+       if (vt->type != V4L2_TUNER_RADIO) {
                vt->rangelow = tv_range[0] * 16;
                vt->rangehigh = tv_range[1] * 16;
                return 0;
        }
 
        /* radio mode */
-       vt->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
-       if (fe_tuner_ops->get_status) {
-               u32 tuner_status;
-
-               fe_tuner_ops->get_status(&t->fe, &tuner_status);
-               vt->rxsubchans =
-                       (tuner_status & TUNER_STATUS_STEREO) ?
-                       V4L2_TUNER_SUB_STEREO :
-                       V4L2_TUNER_SUB_MONO;
+       if (vt->type == t->mode) {
+               vt->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+               if (fe_tuner_ops->get_status) {
+                       u32 tuner_status;
+
+                       fe_tuner_ops->get_status(&t->fe, &tuner_status);
+                       vt->rxsubchans =
+                               (tuner_status & TUNER_STATUS_STEREO) ?
+                               V4L2_TUNER_SUB_STEREO :
+                               V4L2_TUNER_SUB_MONO;
+               }
+               if (analog_ops->has_signal)
+                       vt->signal = analog_ops->has_signal(&t->fe);
+               vt->audmode = t->audmode;
        }
-       if (analog_ops->has_signal)
-               vt->signal = analog_ops->has_signal(&t->fe);
        vt->capability |= V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
-       vt->audmode = t->audmode;
        vt->rangelow = radio_range[0] * 16000;
        vt->rangehigh = radio_range[1] * 16000;