From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Tue, 29 Jun 2010 21:12:05 -0700

quoted text
> From: Dean Nelson <dnelson@redhat.com>
> 
> Should e1000_test_msi() fail to see an msi interrupt, it attempts to
> fallback to legacy INTx interrupts. But an error in the code may prevent
> this from happening correctly.
...
quoted text
> The solution is to have e1000_test_msi() re-read the PCI_COMMAND bits as
> part of its attempt to re-enable SERR.
> 
> During debugging/testing of this issue I found that not all the systems
> I ran on had the SERR bit set to begin with. And on some of the systems
> the same could be said for the INTX_DISABLE bit. Needless to say these
> latter systems didn't have a problem falling back to legacy INTx
> interrupts with the code as is.
> 
> Signed-off-by: Dean Nelson <dnelson@redhat.com>
> CC: stable@kernel.org
> Tested-by: Emil Tantilov <emil.s.tantilov@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.
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