V4L/DVB (10700): saa7115: don't access reg 0x87 if it is not present.

Devices like the saa7111 do not have this register, so check for this
before using it.

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

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/media/video/saa7115.c b/drivers/media/video/saa7115.c
index a845582ca5d4..b1c5f63bb77a 100644
--- a/drivers/media/video/saa7115.c
+++ b/drivers/media/video/saa7115.c
@@ -1310,11 +1310,12 @@ static int saa711x_s_stream(struct v4l2_subdev *sd, int enable)
         v4l2_dbg(1, debug, sd, "%s output\n",
                         enable ? "enable" : "disable");
 
-        if (state->enable != enable) {
-                state->enable = enable;
-                saa711x_write(sd, R_87_I_PORT_I_O_ENA_OUT_CLK_AND_GATED,
-                                state->enable);
-        }
+        if (state->enable == enable)
+                return 0;
+        state->enable = enable;
+        if (!saa711x_has_reg(state->ident, R_87_I_PORT_I_O_ENA_OUT_CLK_AND_GATED))
+                return 0;
+        saa711x_write(sd, R_87_I_PORT_I_O_ENA_OUT_CLK_AND_GATED, state->enable);
         return 0;
 }