[xen staging-4.14] xen/arm: bootfdt: Ignore empty memory bank

[patchbot@xxxxxxx]

commit 7d2b21fd36c2a47799eed71c67bae7faa1ec4272
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Fri Sep 18 18:11:16 2020 +0100
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Thu Nov 5 17:49:04 2020 -0800

    xen/arm: bootfdt: Ignore empty memory bank
    
    At the moment, Xen will stop processing the Device Tree if a memory
    bank is empty (size == 0).
    
    Unfortunately, some of the Device Tree (such as on Colibri imx8qxp)
    may contain such a bank. This means Xen will not be able to boot
    properly.
    
    Relax the check to just ignore the banks. FWIW this also seems to be the
    behavior adopted by Linux.
    
    Reported-by: Daniel Wagner <Daniel.Wagner2@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    (cherry picked from commit 5a37207df52066efefe419c677b089a654d37afc)
---
 xen/arch/arm/bootfdt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 08fb59f4e7..dcff512648 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -163,8 +163,9 @@ static int __init process_memory_node(const void *fdt, int 
node,
     for ( i = 0; i < banks && mem->nr_banks < NR_MEM_BANKS; i++ )
     {
         device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
+        /* Some DT may describe empty bank, ignore them */
         if ( !size )
-            return -EINVAL;
+            continue;
         mem->bank[mem->nr_banks].start = start;
         mem->bank[mem->nr_banks].size = size;
         mem->nr_banks++;
--
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