File 530b28c5-x86-MSI-don-t-risk-division-by-zero.patch of Package xen.openSUSE_13.1_Update

# Commit 5d160d913e03b581bdddde73535c18ac670cf0a9
# Date 2014-02-24 12:11:01 +0100
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/MSI: don't risk division by zero

The check in question is redundant with the one in the immediately
following if(), where dividing by zero gets carefully avoided.

Spotted-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -615,7 +615,7 @@ static u64 read_pci_mem_bar(u16 seg, u8 
             return 0;
         base = pos + PCI_SRIOV_BAR;
         vf -= PCI_BDF(bus, slot, func) + offset;
-        if ( vf < 0 || (vf && vf % stride) )
+        if ( vf < 0 )
             return 0;
         if ( stride )
         {