[PATCH v3 2/7] of: reserved_mem: use -ENODEV instead of -ENOENT

[Marek Szyprowski <m.szyprowski@samsung.com>]

When given reserved memory region doesn't really support given node,
return -ENODEV instead of -ENOENT. Then fix __reserved_mem_init_node()
function to properly propagate error code different from -ENODEV instead
of silently ignoring it.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/of/of_reserved_mem.c | 7 ++++---
 kernel/dma/coherent.c        | 2 +-
 kernel/dma/contiguous.c      | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 6705b7afebf0..9aff460a0420 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -488,9 +488,10 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem,
 {
 	extern const struct of_device_id __reservedmem_of_table[];
 	const struct of_device_id *i;
-	int ret = -ENOENT;
+	int ret = -ENODEV;
 
-	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
+	for (i = __reservedmem_of_table; ret == -ENODEV &&
+	     i < &__rmem_of_table_sentinel; i++) {
 		reservedmem_of_init_fn initfn = i->data;
 		const char *compat = i->compatible;
 
@@ -574,7 +575,7 @@ static void __init fdt_init_reserved_mem_node(struct reserved_mem *rmem,
 	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
 
 	err = __reserved_mem_init_node(rmem, node);
-	if (err != 0 && err != -ENOENT) {
+	if (err != 0 && err != -ENODEV) {
 		pr_info("node %s compatible matching fail\n", rmem->name);
 		if (nomap)
 			memblock_clear_nomap(rmem->base, rmem->size);
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 34621acbd3c5..64f9ba618e19 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -370,7 +370,7 @@ static const struct reserved_mem_ops rmem_dma_ops = {
 static int __init rmem_dma_setup(unsigned long node, struct reserved_mem *rmem)
 {
 	if (of_get_flat_dt_prop(node, "reusable", NULL))
-		return -EINVAL;
+		return -ENODEV;
 
 #ifdef CONFIG_ARM
 	if (!of_get_flat_dt_prop(node, "no-map", NULL)) {
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 81a2fa4971ee..e6fc6906b5c0 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -483,7 +483,7 @@ static int __init rmem_cma_setup(unsigned long node, struct reserved_mem *rmem)
 
 	if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
 	    of_get_flat_dt_prop(node, "no-map", NULL))
-		return -EINVAL;
+		return -ENODEV;
 
 	if (!IS_ALIGNED(rmem->base | rmem->size, CMA_MIN_ALIGNMENT_BYTES)) {
 		pr_err("Reserved memory: incorrect alignment of CMA region\n");
-- 
2.34.1