[Xen-changelog] [xen stable-4.2] x86/MSI: don't risk division by zero

[patchbot@xxxxxxx]

commit f4c6912c95ed5d5bb08e1b07b9588876595ecdbd
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Mar 14 17:45:14 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Mar 14 17:45:14 2014 +0100

    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@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
    master commit: 5d160d913e03b581bdddde73535c18ac670cf0a9
    master date: 2014-02-24 12:11:01 +0100
---
 xen/arch/x86/msi.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index 5da0410..4d98fd1 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -597,7 +597,7 @@ static u64 read_pci_mem_bar(u16 seg, u8 bus, u8 slot, u8 
func, u8 bir, int vf)
             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 )
         {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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