[PATCH] media: drx: fix a missing check of return value

[Kangjie Lu]

Function drxj_dap_write_reg16(), which writes data to buffer, may fail.
We need to check if it fails, and if so, we should goto error.
Otherwise, the buffer will have incorrect data.

Signed-off-by: Kangjie Lu <k...@umn.edu>
---
 drivers/media/dvb-frontends/drx39xyj/drxj.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c 
b/drivers/media/dvb-frontends/drx39xyj/drxj.c
index 551b7d65fa66..d105125bc1c3 100644
--- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
+++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
@@ -2136,9 +2136,13 @@ int drxj_dap_atomic_read_write_block(struct 
i2c_device_addr *dev_addr,
 
                        word = ((u16) data[2 * i]);
                        word += (((u16) data[(2 * i) + 1]) << 8);
-                       drxj_dap_write_reg16(dev_addr,
+                       rc = drxj_dap_write_reg16(dev_addr,
                                             (DRXJ_HI_ATOMIC_BUF_START + i),
                                            word, 0);
+                       if (rc) {
+                               pr_err("error %d\n", rc);
+                               goto rw_error;
+                       }
                }
        }
 
-- 
2.17.2 (Apple Git-113)