[PATCH 4/6] [media] go7007: Use common error handling code in s2250_probe()

[SF Markus Elfring]

From: Markus Elfring <elfr...@users.sourceforge.net>
Date: Mon, 18 Sep 2017 13:50:45 +0200

Adjust jump targets so that a bit of exception handling can be better
reused at the end of this function.

This refactoring might fix also an error situation where the
function "i2c_unregister_device" was not called after a software failure
was noticed by the data member "hdl.error".

Signed-off-by: Markus Elfring <elfr...@users.sourceforge.net>
---
 drivers/media/usb/go7007/s2250-board.c | 37 +++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/drivers/media/usb/go7007/s2250-board.c 
b/drivers/media/usb/go7007/s2250-board.c
index 1fd4c09dd516..1bd9a7f2e7a3 100644
--- a/drivers/media/usb/go7007/s2250-board.c
+++ b/drivers/media/usb/go7007/s2250-board.c
@@ -510,6 +510,7 @@ static int s2250_probe(struct i2c_client *client,
        u8 *data;
        struct go7007 *go = i2c_get_adapdata(adapter);
        struct go7007_usb *usb = go->hpi_context;
+       int code;
 
        audio = i2c_new_dummy(adapter, TLV320_ADDRESS >> 1);
        if (!audio)
@@ -517,8 +518,8 @@ static int s2250_probe(struct i2c_client *client,
 
        state = kzalloc(sizeof(*state), GFP_KERNEL);
        if (!state) {
-               i2c_unregister_device(audio);
-               return -ENOMEM;
+               code = -ENOMEM;
+               goto unregister_device;
        }
 
        sd = &state->sd;
@@ -538,11 +539,8 @@ static int s2250_probe(struct i2c_client *client,
                V4L2_CID_HUE, -512, 511, 1, 0);
        sd->ctrl_handler = &state->hdl;
        if (state->hdl.error) {
-               int err = state->hdl.error;
-
-               v4l2_ctrl_handler_free(&state->hdl);
-               kfree(state);
-               return err;
+               code = state->hdl.error;
+               goto free_handler;
        }
 
        state->std = V4L2_STD_NTSC;
@@ -555,17 +553,13 @@ static int s2250_probe(struct i2c_client *client,
        /* initialize the audio */
        if (write_regs(audio, aud_regs) < 0) {
                dev_err(&client->dev, "error initializing audio\n");
-               goto fail;
+               goto e_io;
        }
 
-       if (write_regs(client, vid_regs) < 0) {
-               dev_err(&client->dev, "error initializing decoder\n");
-               goto fail;
-       }
-       if (write_regs_fp(client, vid_regs_fp) < 0) {
-               dev_err(&client->dev, "error initializing decoder\n");
-               goto fail;
-       }
+       if (write_regs(client, vid_regs) < 0 ||
+           write_regs_fp(client, vid_regs_fp) < 0)
+               goto report_write_failure;
+
        /* set default channel */
        /* composite */
        write_reg_fp(client, 0x20, 0x020 | 1);
@@ -602,11 +596,16 @@ static int s2250_probe(struct i2c_client *client,
        v4l2_info(sd, "initialized successfully\n");
        return 0;
 
-fail:
-       i2c_unregister_device(audio);
+report_write_failure:
+       dev_err(&client->dev, "error initializing decoder\n");
+e_io:
+       code = -EIO;
+free_handler:
        v4l2_ctrl_handler_free(&state->hdl);
        kfree(state);
-       return -EIO;
+unregister_device:
+       i2c_unregister_device(audio);
+       return code;
 }
 
 static int s2250_remove(struct i2c_client *client)
-- 
2.14.1