[PATCH v2 19/19] remoteproc: core: Support empty resource tables

[Loic Pallardy]

From: Lee Jones <lee.jones@xxxxxxxxxx>

Currently, when a remote processor does not require resources, the
platform-specific remoteproc driver has to create a fake resource
table in order to by-pass the strict checking.  But there is no hard
requirement for a remote processor so require or support shared
resources.  This patch removes the strict checking and skips
resource table related operations if none is provided.

Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Loic Pallardy <loic.pallardy@xxxxxx>
---
 drivers/remoteproc/remoteproc_core.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 73b460a..235ca2a 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -685,6 +685,9 @@ static int rproc_handle_resources(struct rproc *rproc, struct resource_table *ta
 	rproc_handle_resource_t handler;
 	int ret = 0, i;
 
+	if (!table_ptr)
+		return ret;
+
 	for (i = 0; i < table_ptr->num; i++) {
 		int offset = table_ptr->offset[i];
 		struct fw_rsc_hdr *hdr = (void *)table_ptr + offset;
@@ -1337,7 +1340,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 	struct device *dev = &rproc->dev;
 	const char *name = rproc->firmware;
 	struct resource_table *table, *loaded_table;
-	int ret, tablesz, local_tablesz;
+	int ret, tablesz = 0, local_tablesz;
 
 	ret = rproc_fw_sanity_check(rproc, fw);
 	if (ret)
@@ -1361,8 +1364,8 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 	/* look for the resource table */
 	table = rproc_find_rsc_table(rproc, fw, &tablesz);
 	if (!table) {
-		dev_err(dev, "Failed to find resource table\n");
-		goto clean_up;
+		rproc->cached_table = table;
+		goto skip_resources;
 	}
 
 	/*  verify resource table consistency */
@@ -1384,6 +1387,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 		goto clean_up;
 	}
 
+skip_resources:
 	rproc->table_ptr = rproc->cached_table;
 
 	if (!list_empty(&rproc->override_resources)) {
-- 
1.9.1