[5/8] Input: st1232 - do not allocate fingers data separately
diff mbox series

Message ID 20191022195622.66976-6-dmitry.torokhov@gmail.com
State Mainlined
Commit ac6b31797925b6f89885987c81d908bad90dea60
Headers show
Series
  • Face lift for st1232 touchscreen driver
Related show

Commit Message

dmitry.torokhov@gmail.com Oct. 22, 2019, 7:56 p.m. UTC
The finger structure size is quite small and allocating it together with
the main driver structure will not increase likelihood of allocation
failing, but reduces number of objects needing to be tracked by the
allocator and devm.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

 drivers/input/touchscreen/st1232.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

Patch
diff mbox series

diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index bfea02202ded..dfc0c6cb0213 100644
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -50,12 +50,12 @@  struct st1232_ts_data {
 	const struct st_chip_info *chip_info;
 	int read_buf_len;
 	u8 *read_buf;
-	struct st1232_ts_finger *finger;
+	struct st1232_ts_finger fingers[];
 };
 
 static int st1232_ts_read_data(struct st1232_ts_data *ts)
 {
-	struct st1232_ts_finger *finger = ts->finger;
+	struct st1232_ts_finger *finger = ts->fingers;
 	struct i2c_client *client = ts->client;
 	u8 start_reg = ts->chip_info->start_reg;
 	struct i2c_msg msg[] = {
@@ -98,7 +98,7 @@  static int st1232_ts_read_data(struct st1232_ts_data *ts)
 static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
 {
 	struct st1232_ts_data *ts = dev_id;
-	struct st1232_ts_finger *finger = ts->finger;
+	struct st1232_ts_finger *finger = ts->fingers;
 	struct input_dev *input_dev = ts->input_dev;
 	int count = 0;
 	int i, ret;
@@ -177,7 +177,6 @@  static int st1232_ts_probe(struct i2c_client *client,
 {
 	const struct st_chip_info *match;
 	struct st1232_ts_data *ts;
-	struct st1232_ts_finger *finger;
 	struct input_dev *input_dev;
 	int error;
 
@@ -199,16 +198,13 @@  static int st1232_ts_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+	ts = devm_kzalloc(&client->dev,
+			  struct_size(ts, fingers, match->max_fingers),
+			  GFP_KERNEL);
 	if (!ts)
 		return -ENOMEM;
 
 	ts->chip_info = match;
-	ts->finger = devm_kcalloc(&client->dev,
-				  ts->chip_info->max_fingers, sizeof(*finger),
-				  GFP_KERNEL);
-	if (!ts->finger)
-		return -ENOMEM;
 
 	/* allocate a buffer according to the number of registers to read */
 	ts->read_buf_len = ts->chip_info->max_fingers * 4;