[media] v4l2: add const to argument of write-only s_frequency ioctl

[linux-block.git] / drivers / media / pci / bt8xx / bttv-driver.c

diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c
index 2fb2168f74e29904e53193ca7c8e760ebcdf1507..3156daf2c80400784f2999279579b219fed72131 100644 (file)
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -1852,24 +1852,26 @@ static int bttv_g_frequency(struct file *file, void *priv,
        return 0;
 }
 
-static void bttv_set_frequency(struct bttv *btv, struct v4l2_frequency *f)
+static void bttv_set_frequency(struct bttv *btv, const struct v4l2_frequency *f)
 {
+       struct v4l2_frequency new_freq = *f;
+
        bttv_call_all(btv, tuner, s_frequency, f);
        /* s_frequency may clamp the frequency, so get the actual
           frequency before assigning radio/tv_freq. */
-       bttv_call_all(btv, tuner, g_frequency, f);
-       if (f->type == V4L2_TUNER_RADIO) {
+       bttv_call_all(btv, tuner, g_frequency, &new_freq);
+       if (new_freq.type == V4L2_TUNER_RADIO) {
                radio_enable(btv);
-               btv->radio_freq = f->frequency;
+               btv->radio_freq = new_freq.frequency;
                if (btv->has_matchbox)
                        tea5757_set_freq(btv, btv->radio_freq);
        } else {
-               btv->tv_freq = f->frequency;
+               btv->tv_freq = new_freq.frequency;
        }
 }
 
 static int bttv_s_frequency(struct file *file, void *priv,
-                                       struct v4l2_frequency *f)
+                                       const struct v4l2_frequency *f)
 {
        struct bttv_fh *fh  = priv;
        struct bttv *btv = fh->btv;