[xen staging] x86/PV: correct post-preemption progress recording in iommu_memory_setup()

[patchbot@xxxxxxx]

commit f732240fd3bac25116151db5ddeb7203b62e85ce
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 27 13:00:08 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 27 13:00:08 2022 +0200

    x86/PV: correct post-preemption progress recording in iommu_memory_setup()
    
    Coverity validly points out that the mfn_add() as used was dead code.
    
    Coverity ID: 1507475
    Fixes: c1e1564c8995 ("IOMMU/x86: perform PV Dom0 mappings in batches")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/pv/dom0_build.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index 323c49b0bd..a62f0fa2ef 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -130,7 +130,7 @@ static void __init iommu_memory_setup(struct domain *d, 
const char *what,
                             IOMMUF_readable | IOMMUF_writable | IOMMUF_preempt,
                             flush_flags)) > 0 )
     {
-        mfn_add(mfn, rc);
+        mfn = mfn_add(mfn, rc);
         nr -= rc;
         /* See comment below. */
         for ( ; rc--; ++page )
--
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