From: Robert Jennings <rcj@linux.vnet.ibm.com>
Date: Fri, 16 Jul 2010 04:57:25 +0000 (+0000)
Subject: ibmveth: lost IRQ while closing/opening device leads to service loss
X-Git-Tag: v2.6.35-rc6~15^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee2e6114de3bdb1c34f3910b690f990483e981ab;p=pandora-kernel.git

ibmveth: lost IRQ while closing/opening device leads to service loss

The order of freeing the IRQ and freeing the device in firmware
in ibmveth_close can cause the adapter to become unusable after a
subsequent ibmveth_open.  Only a reboot of the OS will make the
network device usable again. This is seen when cycling the adapter
up and down while there is network activity.

There is a window where an IRQ will be left unserviced (H_EOI will not
be called).  The solution is to make a VIO_IRQ_DISABLE h_call, free the
device with firmware, and then call free_irq.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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