of/address: use atomic allocation in pci_register_io_range()

When kzalloc() is called under spin_lock(), GFP_ATOMIC should be
used to avoid sleeping allocation.
The call tree is:
  of_pci_range_to_resource()
    --> pci_register_io_range() <-- takes spin_lock(&io_range_lock);
       --> kzalloc()

Signed-off-by: Jingoo Han <jingoohan1@gmail.com>
Cc: stable@vger.kernel.org # 3.18+
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 78a7dcbec7d8..65c3289fb2dc 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -712,7 +712,7 @@ int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
         }
 
         /* add the range to the list */
-        range = kzalloc(sizeof(*range), GFP_KERNEL);
+        range = kzalloc(sizeof(*range), GFP_ATOMIC);
         if (!range) {
                 err = -ENOMEM;
                 goto end_register;