usbnet: ratelimit warning messages invoked from callback handler

Warning messages coming from rtl8150 driver can flood the console
and make a DTV/set-top-box unable to decode video/audio frames.

'Pegasus' driver handles this situation similarly, preventing this
from happening there.

It happens with a low cost BCM MIPS embedded platform, whenever
timeout errors were coming from usbnet device, making platform
unusable for viewer watching.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index f9fb454..fcc6fa0 100644 (file)
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -221,7 +221,8 @@ static void ctrl_callback(struct urb *urb)
        case -ENOENT:
                break;
        default:
-               dev_warn(&urb->dev->dev, "ctrl urb status %d\n", status);
+               if (printk_ratelimit())
+                       dev_warn(&urb->dev->dev, "ctrl urb status %d\n", status);
        }
        dev = urb->context;
        clear_bit(RX_REG_SET, &dev->flags);
@@ -442,10 +443,12 @@ static void read_bulk_callback(struct urb *urb)
        case -ENOENT:
                return; /* the urb is in unlink state */
        case -ETIME:
-               dev_warn(&urb->dev->dev, "may be reset is needed?..\n");
+               if (printk_ratelimit())
+                       dev_warn(&urb->dev->dev, "may be reset is needed?..\n");
                goto goon;
        default:
-               dev_warn(&urb->dev->dev, "Rx status %d\n", status);
+               if (printk_ratelimit())
+                       dev_warn(&urb->dev->dev, "Rx status %d\n", status);
                goto goon;
        }