net/mlxfw: Properly handle dependancy with non-loadable mlx5

If mlx5 is set to be built-in and mlxfw as a module, we
get a link error:

drivers/built-in.o: In function `mlx5_firmware_flash':
(.text+0x5aed72): undefined reference to `mlxfw_firmware_flash'

Since we don't want to mandate selecting mlxfw for mlx5 users, we
use the IS_REACHABLE macro to make sure that a stub is exposed
to the caller.

Signed-off-by: Or Gerlitz <[email protected]>
Reported-by: Jakub Kicinski <[email protected]>
Reported-by: Arnd Bergmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/ethernet/mellanox/mlxfw/mlxfw.h b/drivers/net/ethernet/mellanox/mlxfw/mlxfw.h
index 9ca85383aa35e64b842b7013bcfa3d07efdd9920..7a712b6b09ec11852444eb8ce2df18823b155be2 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxfw/mlxfw.h
+++ b/drivers/net/ethernet/mellanox/mlxfw/mlxfw.h
@@ -96,7 +96,7 @@ struct mlxfw_dev {
        u16 psid_size;
 };
 
-#if IS_ENABLED(CONFIG_MLXFW)
+#if IS_REACHABLE(CONFIG_MLXFW)
 int mlxfw_firmware_flash(struct mlxfw_dev *mlxfw_dev,
                         const struct firmware *firmware);
 #else