dm: core: Fix iteration over driver_info records

We should only perform additional iteration steps when needed to
initialize the parent of a device. Other binding errors (such as a
missing driver) should not lead to additional iteration steps.

Unnecessary iteration steps can cause issues when memory is tightly
constrained (such as in the TPL/SPL) since device_bind_by_name()
unconditionally allocates memory for a struct udevice. On the SanCloud
BBE this led to boot failure caused by memory exhaustion in the SPL
when booting from SPI flash.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>

diff --git a/drivers/core/lists.c b/drivers/core/lists.c
index 3878957..8034a8f 100644 (file)
--- a/drivers/core/lists.c
+++ b/drivers/core/lists.c
@@ -120,10 +120,10 @@ int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
                int ret;
 
                ret = bind_drivers_pass(parent, pre_reloc_only);
-               if (!ret)
-                       break;
-               if (ret != -EAGAIN && !result)
+               if (!result || result == -EAGAIN)
                        result = ret;
+               if (ret != -EAGAIN)
+                       break;
        }
 
        return result;