tree 2c5b72a06bba90a0cfbf4b1ae93c4ba5d41278ef
parent 6cdd20c380eb62eab757c5a6ccc90dac7ecd774b
author Bjørn Mork <bjorn@mork.no> 1359417088 +0000
committer David S. Miller <davem@davemloft.net> 1359585344 -0500

net: usbnet: prevent buggy devices from killing us

A device sending 0 length frames as fast as it can has been
observed killing the host system due to the resulting memory
pressure.

Temporarily disable RX skb allocation and URB submission when
the current error ratio is high, preventing us from trying to
allocate an infinite number of skbs.  Reenable as soon as we
are finished processing the done queue, allowing the device
to continue working after short error bursts.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>