[PATCH v1 5/5] Input: edt-ft5x06 - allocate buffer once for debugging

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

There is no need to allocate buffer each time we switch modes. First of all,
the code is protected by checking the factory_mode state. The size of the
buffer is static and can't be changed after ->probe() anyway.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/input/touchscreen/edt-ft5x06.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 1023d4134b8d..3895e194006a 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -544,16 +544,6 @@ static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 
 	disable_irq(client->irq);
 
-	if (!tsdata->raw_buffer) {
-		tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
-				      sizeof(u16);
-		tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
-		if (!tsdata->raw_buffer) {
-			error = -ENOMEM;
-			goto err_out;
-		}
-	}
-
 	/* mode register is 0x3c when in the work mode */
 	error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
 	if (error) {
@@ -581,8 +571,6 @@ static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
 	return 0;
 
 err_out:
-	kfree(tsdata->raw_buffer);
-	tsdata->raw_buffer = NULL;
 	tsdata->factory_mode = false;
 	enable_irq(client->irq);
 
@@ -622,9 +610,6 @@ static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
 		return -EIO;
 	}
 
-	kfree(tsdata->raw_buffer);
-	tsdata->raw_buffer = NULL;
-
 	/* restore parameters */
 	edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
 				  tsdata->threshold);
@@ -697,7 +682,7 @@ static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
 
 	mutex_lock(&tsdata->mutex);
 
-	if (!tsdata->factory_mode || !tsdata->raw_buffer) {
+	if (!tsdata->factory_mode) {
 		error = -EIO;
 		goto out;
 	}
@@ -774,6 +759,12 @@ edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
 
 	debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 			    tsdata->debug_dir, tsdata, &debugfs_mode_fops);
+
+	tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y * sizeof(u16);
+	tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
+	if (!tsdata->raw_buffer)
+		return;
+
 	debugfs_create_file("raw_data", S_IRUSR,
 			    tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
 }
-- 
2.25.1