[PATCH 7/7] Input: synaptics - handle errors from input_mt_init_slots()

From: Dmitry Torokhov
Date: Fri Jan 19 2018 - 18:08:08 EST


input_mt_init_slots() may fail, we need to handle this condition.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/mouse/synaptics.c | 33 ++++++++++++++++++++++++---------
1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index feb9c04d0eae2..dcb8e0cfaa1af 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -1228,12 +1228,13 @@ static void set_abs_position_params(struct input_dev *dev,
input_abs_set_res(dev, y_code, info->y_res);
}

-static void set_input_params(struct psmouse *psmouse,
- struct synaptics_data *priv)
+static int set_input_params(struct psmouse *psmouse,
+ struct synaptics_data *priv)
{
struct input_dev *dev = psmouse->dev;
struct synaptics_device_info *info = &priv->info;
int i;
+ int error;

/* Reset default psmouse capabilities */
__clear_bit(EV_REL, dev->evbit);
@@ -1256,7 +1257,7 @@ static void set_input_params(struct psmouse *psmouse,
/* Relative mode */
input_set_capability(dev, EV_REL, REL_X);
input_set_capability(dev, EV_REL, REL_Y);
- return;
+ return 0;
}

/* Absolute mode */
@@ -1271,7 +1272,11 @@ static void set_input_params(struct psmouse *psmouse,
ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
/* Image sensors can report per-contact pressure */
input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
- input_mt_init_slots(dev, 2, INPUT_MT_POINTER | INPUT_MT_TRACK);
+
+ error = input_mt_init_slots(dev, 2,
+ INPUT_MT_POINTER | INPUT_MT_TRACK);
+ if (error)
+ return error;

/* Image sensors can signal 4 and 5 finger clicks */
input_set_capability(dev, EV_KEY, BTN_TOOL_QUADTAP);
@@ -1283,10 +1288,13 @@ static void set_input_params(struct psmouse *psmouse,
* Profile sensor in CR-48 tracks contacts reasonably well,
* other non-image sensors with AGM use semi-mt.
*/
- input_mt_init_slots(dev, 2,
- INPUT_MT_POINTER |
- (cr48_profile_sensor ?
- INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
+ error = input_mt_init_slots(dev, 2,
+ INPUT_MT_POINTER |
+ (cr48_profile_sensor ?
+ INPUT_MT_TRACK :
+ INPUT_MT_SEMI_MT));
+ if (error)
+ return error;

/*
* For semi-mt devices we send ABS_X/Y ourselves instead of
@@ -1326,6 +1334,8 @@ static void set_input_params(struct psmouse *psmouse,
!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
__set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
}
+
+ return 0;
}

static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
@@ -1563,7 +1573,12 @@ static int synaptics_init_ps2(struct psmouse *psmouse,
info->capabilities, info->ext_cap, info->ext_cap_0c,
info->ext_cap_10, info->board_id, info->firmware_id);

- set_input_params(psmouse, priv);
+ err = set_input_params(psmouse, priv);
+ if (err) {
+ psmouse_err(psmouse,
+ "failed to set up capabilities: %d\n", err);
+ goto init_fail;
+ }

/*
* Encode touchpad model so that it can be used to set
--
2.16.0.rc1.238.g530d649a79-goog