[PATCH 1/4] input: tablet: pegasus_notetaker: Track usb control msg errors

[Martin Kepplinger]

Signed-off-by: Martin Kepplinger <mart...@posteo.de>
---
 drivers/input/tablet/pegasus_notetaker.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/input/tablet/pegasus_notetaker.c 
b/drivers/input/tablet/pegasus_notetaker.c
index 83aa583..27cb352 100644
--- a/drivers/input/tablet/pegasus_notetaker.c
+++ b/drivers/input/tablet/pegasus_notetaker.c
@@ -79,7 +79,7 @@ struct pegasus {
        struct work_struct init;
 };
 
-static void pegasus_control_msg(struct pegasus *pegasus, u8 *data, int len)
+static int pegasus_control_msg(struct pegasus *pegasus, u8 *data, int len)
 {
        const int sizeof_buf = len + 2;
        int result;
@@ -87,7 +87,7 @@ static void pegasus_control_msg(struct pegasus *pegasus, u8 
*data, int len)
 
        cmd_buf = kmalloc(sizeof_buf, GFP_KERNEL);
        if (!cmd_buf)
-               return;
+               return -ENOMEM;
 
        cmd_buf[0] = NOTETAKER_REPORT_ID;
        cmd_buf[1] = len;
@@ -100,17 +100,23 @@ static void pegasus_control_msg(struct pegasus *pegasus, 
u8 *data, int len)
                                 0, 0, cmd_buf, sizeof_buf,
                                 USB_CTRL_SET_TIMEOUT);
 
-       if (result != sizeof_buf)
-               dev_err(&pegasus->usbdev->dev, "control msg error\n");
+       if (result != sizeof_buf) {
+               if (result >= 0)
+                       result = -EIO;
+               dev_err(&pegasus->usbdev->dev, "control msg error: %d\n",
+                       result);
+       }
 
        kfree(cmd_buf);
+
+       return result;
 }
 
-static void pegasus_set_mode(struct pegasus *pegasus, u8 mode, u8 led)
+static int pegasus_set_mode(struct pegasus *pegasus, u8 mode, u8 led)
 {
        u8 cmd[] = {NOTETAKER_SET_CMD, NOTETAKER_SET_MODE, led, mode};
 
-       pegasus_control_msg(pegasus, cmd, sizeof(cmd));
+       return pegasus_control_msg(pegasus, cmd, sizeof(cmd));
 }
 
 static void pegasus_parse_packet(struct pegasus *pegasus)
@@ -184,8 +190,12 @@ static void pegasus_irq(struct urb *urb)
 static void pegasus_init(struct work_struct *work)
 {
        struct pegasus *pegasus = container_of(work, struct pegasus, init);
+       int retval;
 
-       pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
+       retval = pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
+       if (retval < 0)
+               dev_err(&pegasus->usbdev->dev, "pegasus_set_mode error: %d\n",
+                       retval);
 }
 
 static int pegasus_open(struct input_dev *dev)
@@ -201,7 +211,7 @@ static int pegasus_open(struct input_dev *dev)
        if (usb_submit_urb(pegasus->irq, GFP_KERNEL))
                retval = -EIO;
 
-       pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
+       retval = pegasus_set_mode(pegasus, PEN_MODE_XY, NOTETAKER_LED_MOUSE);
 
        usb_autopm_put_interface(pegasus->intf);
 
-- 
2.1.4