linux-kernel - [PATCH v10 37/55] Input: atmel_mxt_ts - Change call-points of mxt_free

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Date:   Tue, 31 Mar 2020 03:50:33 -0700
From:   Jiada Wang <jiada_wang@...tor.com>
To:     <nick@...anahar.org>, <dmitry.torokhov@...il.com>,
        <jikos@...nel.org>, <benjamin.tissoires@...hat.com>,
        <bsz@...ihalf.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>,
        <jiada_wang@...tor.com>
Subject: [PATCH v10 37/55] Input: atmel_mxt_ts - Change call-points of mxt_free_* functions

From: Kautuk Consul <kautuk_consul@...tor.com>

Revamping the code to call mxt_free_object_table and mxt_free_input_device
functions only in the following scenarios and code paths:
1) The error path of the mxt_probe() entry point
2) The mxt_remove de-init path entry point
3) All paths which definitely expect to populate the object table
   like:
   - the mxt_update_fw_store path which first calls
     mxt_load_fw and then resorts to calling mxt_initialize itself.
   - the mxt_read_info_block function which attempts to fill in the
     object table itself as the main non-error part of the logic.
4) All paths in the code expected to definitely allocate and register
   the input device such as:
   - the mxt_update_fw_store path which first calls
     mxt_load_fw and then resorts to calling mxt_initialize itself.
   - the mxt_update_cfg_store function which will call
     mxt_configure_objects.

Signed-off-by: Kautuk Consul <kautuk_consul@...tor.com>
Signed-off-by: George G. Davis <george_davis@...tor.com>
Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 36a87d9b9c83..860e8ddd4c6b 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3336,21 +3336,21 @@ static int mxt_configure_objects(struct mxt_data *data,
 	error = mxt_init_t7_power_cfg(data);
 	if (error) {
 		dev_err(dev, "Failed to initialize power cfg\n");
-		goto err_free_object_table;
+		return error;
 	}
 
 	if (cfg) {
 		error = mxt_update_cfg(data, cfg);
 		if (error) {
 			dev_warn(dev, "Error %d updating config\n", error);
-			goto err_free_object_table;
+			return error;
 		}
 	}
 
 	if (data->multitouch) {
 		error = mxt_initialize_input_device(data);
 		if (error)
-			goto err_free_object_table;
+			return error;
 	} else {
 		dev_warn(dev, "No touch object detected\n");
 	}
@@ -3358,10 +3358,6 @@ static int mxt_configure_objects(struct mxt_data *data,
 	mxt_debug_init(data);
 
 	return 0;
-
-err_free_object_table:
-	mxt_free_object_table(data);
-	return error;
 }
 
 /* Configuration crc check sum is returned as hex xxxxxx */
@@ -4106,16 +4102,21 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	error = mxt_initialize(data);
 	if (error)
-		return error;
+		goto err_free_object;
 
 	error = sysfs_create_group(&client->dev.kobj, &mxt_fw_attr_group);
 	if (error) {
 		dev_err(&client->dev, "Failure %d creating fw sysfs group\n",
 			error);
-		return error;
+		goto err_free_object;
 	}
 
 	return 0;
+
+err_free_object:
+	mxt_free_input_device(data);
+	mxt_free_object_table(data);
+	return error;
 }
 
 static int mxt_remove(struct i2c_client *client)
-- 
2.17.1