xen/swiotlb: Move the nr_tbl determination in its own function.

Moving the function out of the way to prepare for the late
SWIOTLB init.

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 11 insertions, 10 deletions

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 1afb4fba11b4..a2aad6ec2401 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -144,25 +144,26 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
         } while (i < nslabs);
         return 0;
 }
+static unsigned long xen_set_nslabs(unsigned long nr_tbl)
+{
+        if (!nr_tbl) {
+                xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
+                xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
+        } else
+                xen_io_tlb_nslabs = nr_tbl;
 
+        return xen_io_tlb_nslabs << IO_TLB_SHIFT;
+}
 void __init xen_swiotlb_init(int verbose)
 {
         unsigned long bytes;
         int rc = -ENOMEM;
-        unsigned long nr_tbl;
         char *m = NULL;
         unsigned int repeat = 3;
 
-        nr_tbl = swiotlb_nr_tbl();
-        if (nr_tbl)
-                xen_io_tlb_nslabs = nr_tbl;
-        else {
-                xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
-                xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
-        }
+        xen_io_tlb_nslabs = swiotlb_nr_tbl();
 retry:
-        bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
-
+        bytes = xen_set_nslabs(xen_io_tlb_nslabs);
         /*
          * Get IO TLB memory from any location.
          */