[media] wl128x: fix compiler warning + wrong write() return

The fix is to check for ret and return -EFAULT if non-zero.

I also noticed that write() didn't return the number of bytes written.
Fixed as well.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/radio/wl128x/fmdrv_v4l2.c b/drivers/media/radio/wl128x/fmdrv_v4l2.c
index 8c0e19276970..478d1e93ada6 100644
--- a/drivers/media/radio/wl128x/fmdrv_v4l2.c
+++ b/drivers/media/radio/wl128x/fmdrv_v4l2.c
@@ -84,12 +84,14 @@ static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
         ret = copy_from_user(&rds, buf, sizeof(rds));
         fmdbg("(%d)type: %d, text %s, af %d\n",
                    ret, rds.text_type, rds.text, rds.af_freq);
+        if (ret)
+                return -EFAULT;
 
         fmdev = video_drvdata(file);
         fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
         fm_tx_set_af(fmdev, rds.af_freq);
 
-        return 0;
+        return sizeof(rds);
 }
 
 static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)