V4L/DVB: dvb_ca_en50221: return -EFAULT on copy_to_user errors

copy_to_user() returns the number of bytes remaining to be copied which
isn't the right thing to return here.  The comments say that these
functions in dvb_ca_en50221.c should return the number of bytes copied or
an error return.  I've changed it to return -EFAULT.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
index ef259a0718ac3176befc7e283f67145f5d0d4d0c..cb97e6b8543295971d30f8b21c233791a725f26e 100644 (file)
--- a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
@@ -1318,8 +1318,11 @@ static ssize_t dvb_ca_en50221_io_write(struct file *file,
 
                fragbuf[0] = connection_id;
                fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
-               if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
+               status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
+               if (status) {
+                       status = -EFAULT;
                        goto exit;
+               }
 
                timeout = jiffies + HZ / 2;
                written = 0;
@@ -1494,8 +1497,11 @@ static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
 
        hdr[0] = slot;
        hdr[1] = connection_id;
-       if ((status = copy_to_user(buf, hdr, 2)) != 0)
+       status = copy_to_user(buf, hdr, 2);
+       if (status) {
+               status = -EFAULT;
                goto exit;
+       }
        status = pktlen;
 
 exit: