Input: cm109 - convert high volume dev_err() to dev_err_ratelimited()

BugLink: http://bugs.launchpad.net/bugs/1222850
This input device can get into a state that produces a high
volume of device status errors. Attempt to throttle these
error messages such that the kernel log is not flooded.

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
index 082684e..9365535 100644 (file)
--- a/drivers/input/misc/cm109.c
+++ b/drivers/input/misc/cm109.c
@@ -351,7 +351,9 @@ static void cm109_urb_irq_callback(struct urb *urb)
        if (status) {
                if (status == -ESHUTDOWN)
                        return;
-               dev_err(&dev->intf->dev, "%s: urb status %d\n", __func__, status);
+               dev_err_ratelimited(&dev->intf->dev, "%s: urb status %d\n",
+                                   __func__, status);
+               goto out;
        }
 
        /* Special keys */
@@ -418,8 +420,12 @@ static void cm109_urb_ctl_callback(struct urb *urb)
             dev->ctl_data->byte[2],
             dev->ctl_data->byte[3]);
 
-       if (status)
-               dev_err(&dev->intf->dev, "%s: urb status %d\n", __func__, status);
+       if (status) {
+               if (status == -ESHUTDOWN)
+                       return;
+               dev_err_ratelimited(&dev->intf->dev, "%s: urb status %d\n",
+                                   __func__, status);
+       }
 
        spin_lock(&dev->ctl_submit_lock);
 
@@ -427,7 +433,7 @@ static void cm109_urb_ctl_callback(struct urb *urb)
 
        if (likely(!dev->shutdown)) {
 
-               if (dev->buzzer_pending) {
+               if (dev->buzzer_pending || status) {
                        dev->buzzer_pending = 0;
                        dev->ctl_urb_pending = 1;
                        cm109_submit_buzz_toggle(dev);