powerpc: Stop using of_root

Replace all usages of of_root by of_find_node_by_path("/")

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231214103152.12269-5-mpe@ellerman.id.au

Author: chleroy

arch/powerpc/kernel/secure_boot.c

@@ -32,8 +32,10 @@ bool is_ppc_secureboot_enabled(void)
 	if (enabled)
 		goto out;
 
-	if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot))
+	node = of_find_node_by_path("/");
+	if (!of_property_read_u32(node, "ibm,secure-boot", &secureboot))
 		enabled = (secureboot > 1);
+	of_node_put(node);
 
 out:
 	pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
@@ -54,8 +56,10 @@ bool is_ppc_trustedboot_enabled(void)
 	if (enabled)
 		goto out;
 
-	if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot))
+	node = of_find_node_by_path("/");
+	if (!of_property_read_u32(node, "ibm,trusted-boot", &trustedboot))
 		enabled = (trustedboot > 0);
+	of_node_put(node);
 
 out:
 	pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");

arch/powerpc/kexec/ranges.c

@@ -385,14 +385,16 @@ int add_opal_mem_range(struct crash_mem **mem_ranges)
 int add_reserved_mem_ranges(struct crash_mem **mem_ranges)
 {
 	int n_mem_addr_cells, n_mem_size_cells, i, len, cells, ret = 0;
+	struct device_node *root = of_find_node_by_path("/");
 	const __be32 *prop;
 
-	prop = of_get_property(of_root, "reserved-ranges", &len);
+	prop = of_get_property(root, "reserved-ranges", &len);
+	n_mem_addr_cells = of_n_addr_cells(root);
+	n_mem_size_cells = of_n_size_cells(root);
+	of_node_put(root);
 	if (!prop)
 		return 0;
 
-	n_mem_addr_cells = of_n_addr_cells(of_root);
-	n_mem_size_cells = of_n_size_cells(of_root);
 	cells = n_mem_addr_cells + n_mem_size_cells;
 
 	/* Each reserved range is an (address,size) pair */

arch/powerpc/mm/drmem.c

@@ -393,17 +393,17 @@ static const __be32 *of_get_usable_memory(struct device_node *dn)
 int walk_drmem_lmbs(struct device_node *dn, void *data,
 		    int (*func)(struct drmem_lmb *, const __be32 **, void *))
 {
+	struct device_node *root = of_find_node_by_path("/");
 	const __be32 *prop, *usm;
 	int ret = -ENODEV;
 
-	if (!of_root)
+	if (!root)
 		return ret;
 
 	/* Get the address & size cells */
-	of_node_get(of_root);
-	n_root_addr_cells = of_n_addr_cells(of_root);
-	n_root_size_cells = of_n_size_cells(of_root);
-	of_node_put(of_root);
+	n_root_addr_cells = of_n_addr_cells(root);
+	n_root_size_cells = of_n_size_cells(root);
+	of_node_put(root);
 
 	if (init_drmem_lmb_size(dn))
 		return ret;

arch/powerpc/mm/numa.c

@@ -1111,7 +1111,7 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
 
 static void __init find_possible_nodes(void)
 {
-	struct device_node *rtas;
+	struct device_node *rtas, *root;
 	const __be32 *domains = NULL;
 	int prop_length, max_nodes;
 	u32 i;
@@ -1132,10 +1132,12 @@ static void __init find_possible_nodes(void)
 	 * If the LPAR is migratable, new nodes might be activated after a LPM,
 	 * so we should consider the max number in that case.
 	 */
-	if (!of_get_property(of_root, "ibm,migratable-partition", NULL))
+	root = of_find_node_by_path("/");
+	if (!of_get_property(root, "ibm,migratable-partition", NULL))
 		domains = of_get_property(rtas,
 					  "ibm,current-associativity-domains",
 					  &prop_length);
+	of_node_put(root);
 	if (!domains) {
 		domains = of_get_property(rtas, "ibm,max-associativity-domains",
 					&prop_length);

arch/powerpc/platforms/52xx/efika.c

@@ -195,8 +195,10 @@ static void __init efika_setup_arch(void)
 
 static int __init efika_probe(void)
 {
-	const char *model = of_get_property(of_root, "model", NULL);
+	struct device_node *root = of_find_node_by_path("/");
+	const char *model = of_get_property(root, "model", NULL);
 
+	of_node_put(root);
 	if (model == NULL)
 		return 0;
 	if (strcmp(model, "EFIKA5K2"))

arch/powerpc/platforms/pasemi/pci.c

@@ -270,16 +270,18 @@ static int __init pas_add_bridge(struct device_node *dev)
 
 void __init pas_pci_init(void)
 {
+	struct device_node *root = of_find_node_by_path("/");
 	struct device_node *np;
 	int res;
 
 	pci_set_flags(PCI_SCAN_ALL_PCIE_DEVS);
 
-	np = of_find_compatible_node(of_root, NULL, "pasemi,rootbus");
+	np = of_find_compatible_node(root, NULL, "pasemi,rootbus");
 	if (np) {
 		res = pas_add_bridge(np);
 		of_node_put(np);
 	}
+	of_node_put(root);
 }
 
 void __iomem *__init pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset)

arch/powerpc/platforms/pseries/lparcfg.c

@@ -346,9 +346,13 @@ static int read_rtas_lpar_name(struct seq_file *m)
  */
 static int read_dt_lpar_name(struct seq_file *m)
 {
+	struct device_node *root = of_find_node_by_path("/");
 	const char *name;
+	int ret;
 
-	if (of_property_read_string(of_root, "ibm,partition-name", &name))
+	ret = of_property_read_string(root, "ibm,partition-name", &name);
+	of_node_put(root);
+	if (ret)
 		return -ENOENT;
 
 	seq_printf(m, "partition_name=%s\n", name);

arch/powerpc/platforms/pseries/setup.c

@@ -1029,9 +1029,11 @@ static void __init pseries_add_hw_description(void)
 		return;
 	}
 
-	if (of_property_read_bool(of_root, "ibm,powervm-partition") ||
-	    of_property_read_bool(of_root, "ibm,fw-net-version"))
+	dn = of_find_node_by_path("/");
+	if (of_property_read_bool(dn, "ibm,powervm-partition") ||
+	    of_property_read_bool(dn, "ibm,fw-net-version"))
 		seq_buf_printf(&ppc_hw_desc, "hv:phyp ");
+	of_node_put(dn);
 }
 
 /*
@@ -1091,7 +1093,11 @@ static void pseries_power_off(void)
 
 static int __init pSeries_probe(void)
 {
-	if (!of_node_is_type(of_root, "chrp"))
+	struct device_node *root = of_find_node_by_path("/");
+	bool ret = of_node_is_type(root, "chrp");
+
+	of_node_put(root);
+	if (!ret)
 		return 0;
 
 	/* Cell blades firmware claims to be chrp while it's not. Until this