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>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
index 082684e7f390..9365535ba7f1 100644
--- 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);