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From: Jack F Vogel <jfv@FreeBSD.org>
Date: Tue, 6 Aug 2013 18:00:53 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r254002 - head/sys/dev/e1000
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Author: jfv
Date: Tue Aug  6 18:00:53 2013
New Revision: 254002
URL: http://svnweb.freebsd.org/changeset/base/254002

Log:
  When the igb driver is static there are cases when early interrupts occur,
  resulting in a panic in refresh_mbufs, to prevent this add a check in the
  interrupt handler for DRV_RUNNING.
  
  MFC after: 1 day (critical for 9.2)

Modified:
  head/sys/dev/e1000/if_igb.c

Modified: head/sys/dev/e1000/if_igb.c
==============================================================================
--- head/sys/dev/e1000/if_igb.c	Tue Aug  6 17:22:06 2013	(r254001)
+++ head/sys/dev/e1000/if_igb.c	Tue Aug  6 18:00:53 2013	(r254002)
@@ -1572,6 +1572,10 @@ igb_msix_que(void *arg)
 	u32		newitr = 0;
 	bool		more_rx;
 
+	/* Ignore spurious interrupts */
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
+		return;
+
 	E1000_WRITE_REG(&adapter->hw, E1000_EIMC, que->eims);
 	++que->irqs;