common/fdt_support.c: sparse fixes

trivial:

fdt_support.c:89:64: warning: Using plain integer as NULL pointer
fdt_support.c:325:65: warning: Using plain integer as NULL pointer
fdt_support.c:352:65: warning: Using plain integer as NULL pointer

For the following bad constant expression, We hardcode the max. number of
memory banks to four for the foreseeable future, and add an error with
instructions on what to do once it's exceeded:

fdt_support.c:397:22: error: bad constant expression

For the rest below, sparse found a couple of wrong endian conversions
in of_bus_default_translate() and fdt_get_base_address(), but
otherwise the rest is mostly annotation fixes:

fdt_support.c:64:24: warning: cast to restricted __be32
fdt_support.c:192:21: warning: incorrect type in assignment (different base types)
fdt_support.c:192:21:    expected unsigned int [unsigned] [usertype] tmp
fdt_support.c:192:21:    got restricted __be32 [usertype] <noident>
fdt_support.c:201:21: warning: incorrect type in assignment (different base types)
fdt_support.c:201:21:    expected unsigned int [unsigned] [addressable] [usertype] tmp
fdt_support.c:201:21:    got restricted __be32 [usertype] <noident>
fdt_support.c:304:13: warning: incorrect type in assignment (different base types)
fdt_support.c:304:13:    expected unsigned int [unsigned] [usertype] val
fdt_support.c:304:13:    got restricted __be32 [usertype] <noident>
fdt_support.c:333:13: warning: incorrect type in assignment (different base types)
fdt_support.c:333:13:    expected unsigned int [unsigned] [usertype] val
fdt_support.c:333:13:    got restricted __be32 [usertype] <noident>
fdt_support.c:359:13: warning: incorrect type in assignment (different base types)
fdt_support.c:359:13:    expected unsigned int [unsigned] [usertype] val
fdt_support.c:359:13:    got restricted __be32 [usertype] <noident>
fdt_support.c:373:21: warning: cast to restricted __be32
fdt_support.c:963:48: warning: incorrect type in argument 1 (different base types)
fdt_support.c:963:48:    expected restricted __be32 const [usertype] *p
fdt_support.c:963:48:    got unsigned int [usertype] *<noident>
fdt_support.c:971:48: warning: incorrect type in argument 1 (different base types)
fdt_support.c:971:48:    expected restricted __be32 const [usertype] *p
fdt_support.c:971:48:    got unsigned int [usertype] *<noident>
fdt_support.c:984:29: warning: incorrect type in argument 1 (different base types)
fdt_support.c:984:29:    expected restricted __be32 const [usertype] *cell
fdt_support.c:984:29:    got unsigned int [usertype] *addr
fdt_support.c:996:32: warning: incorrect type in argument 1 (different base types)
fdt_support.c:996:32:    expected restricted __be32 const [usertype] *cell
fdt_support.c:996:32:    got unsigned int [usertype] *addr
fdt_support.c:1041:41: warning: incorrect type in argument 1 (different base types)
fdt_support.c:1041:41:    expected restricted __be32 const [usertype] *cell
fdt_support.c:1041:41:    got unsigned int [usertype] *addr
fdt_support.c:1053:41: warning: incorrect type in argument 2 (different base types)
fdt_support.c:1053:41:    expected restricted __be32 const [usertype] *range
fdt_support.c:1053:41:    got unsigned int const [usertype] *[assigned] ranges
fdt_support.c:1064:53: warning: incorrect type in argument 2 (different base types)
fdt_support.c:1064:53:    expected restricted __be32 const [usertype] *addr
fdt_support.c:1064:53:    got unsigned int [usertype] *addr
fdt_support.c:1110:50: warning: incorrect type in argument 2 (different base types)
fdt_support.c:1110:50:    expected restricted __be32 const [usertype] *addr
fdt_support.c:1110:50:    got unsigned int *<noident>
fdt_support.c:1121:49: warning: incorrect type in argument 1 (different base types)
fdt_support.c:1121:49:    expected restricted __be32 const [usertype] *cell
fdt_support.c:1121:49:    got unsigned int *<noident>
fdt_support.c:1147:60: warning: incorrect type in argument 2 (different base types)
fdt_support.c:1147:60:    expected restricted __be32 const [usertype] *addr
fdt_support.c:1147:60:    got unsigned int *<noident>
fdt_support.c:1081:5: warning: symbol '__of_translate_address' was not declared. Should it be static?
fdt_support.c:1154:5: error: symbol 'fdt_translate_address' redeclared with different type (originally declared at include/fdt_support.h:95) - incompatible argument 3 (different base types)
fdt_support.c: In function 'fdt_node_offset_by_compat_reg':
fdt_support.c:1173:17: warning: initialization discards 'const' qualifier from pointer target type [enabled by default]

See also linux kernel commit 0131d897 "of/address: use proper
endianess in get_flags".

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Jerry Van Baren <gvb.uboot@gmail.com>

arch/powerpc/cpu/mpc85xx/fdt.c

@@ -811,7 +811,7 @@ int ft_verify_fdt(void *fdt)
 #ifdef CONFIG_SYS_LBC_ADDR
 	off = fdt_node_offset_by_compatible(fdt, -1, "fsl,elbc");
 	if (off > 0) {
-		const u32 *reg = fdt_getprop(fdt, off, "reg", NULL);
+		const fdt32_t *reg = fdt_getprop(fdt, off, "reg", NULL);
 		if (reg) {
 			uint64_t uaddr = CCSR_VIRT_TO_PHYS(CONFIG_SYS_LBC_ADDR);
 

common/fdt_support.c

@@ -51,7 +51,7 @@ DECLARE_GLOBAL_DATA_PTR;
 u32 fdt_getprop_u32_default(const void *fdt, const char *path,
 				const char *prop, const u32 dflt)
 {
-	const u32 *val;
+	const fdt32_t *val;
 	int off;
 
 	off = fdt_path_offset(fdt, path);
@@ -85,7 +85,7 @@ int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
 	if (nodeoff < 0)
 		return nodeoff;
 
-	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
+	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
 		return 0; /* create flag not set; so exit quietly */
 
 	return fdt_setprop(fdt, nodeoff, prop, val, len);
@@ -149,7 +149,7 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
 {
 	int   nodeoffset;
 	int   err, j, total;
-	u32   tmp;
+	fdt32_t  tmp;
 	const char *path;
 	uint64_t addr, size;
 
@@ -188,7 +188,7 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
 
 	path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
 	if ((path == NULL) || force) {
-		tmp = __cpu_to_be32(initrd_start);
+		tmp = cpu_to_fdt32(initrd_start);
 		err = fdt_setprop(fdt, nodeoffset,
 			"linux,initrd-start", &tmp, sizeof(tmp));
 		if (err < 0) {
@@ -197,7 +197,7 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
 				fdt_strerror(err));
 			return err;
 		}
-		tmp = __cpu_to_be32(initrd_end);
+		tmp = cpu_to_fdt32(initrd_end);
 		err = fdt_setprop(fdt, nodeoffset,
 			"linux,initrd-end", &tmp, sizeof(tmp));
 		if (err < 0) {
@@ -300,8 +300,8 @@ void do_fixup_by_path(void *fdt, const char *path, const char *prop,
 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
 			  u32 val, int create)
 {
-	val = cpu_to_fdt32(val);
-	do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
+	fdt32_t tmp = cpu_to_fdt32(val);
+	do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
 }
 
 void do_fixup_by_prop(void *fdt,
@@ -319,7 +319,7 @@ void do_fixup_by_prop(void *fdt,
 #endif
 	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
 	while (off != -FDT_ERR_NOTFOUND) {
-		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
+		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
 			fdt_setprop(fdt, off, prop, val, len);
 		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
 	}
@@ -329,8 +329,8 @@ void do_fixup_by_prop_u32(void *fdt,
 			  const char *pname, const void *pval, int plen,
 			  const char *prop, u32 val, int create)
 {
-	val = cpu_to_fdt32(val);
-	do_fixup_by_prop(fdt, pname, pval, plen, prop, &val, 4, create);
+	fdt32_t tmp = cpu_to_fdt32(val);
+	do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
 }
 
 void do_fixup_by_compat(void *fdt, const char *compat,
@@ -346,7 +346,7 @@ void do_fixup_by_compat(void *fdt, const char *compat,
 #endif
 	off = fdt_node_offset_by_compatible(fdt, -1, compat);
 	while (off != -FDT_ERR_NOTFOUND) {
-		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
+		if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
 			fdt_setprop(fdt, off, prop, val, len);
 		off = fdt_node_offset_by_compatible(fdt, off, compat);
 	}
@@ -355,8 +355,8 @@ void do_fixup_by_compat(void *fdt, const char *compat,
 void do_fixup_by_compat_u32(void *fdt, const char *compat,
 			    const char *prop, u32 val, int create)
 {
-	val = cpu_to_fdt32(val);
-	do_fixup_by_compat(fdt, compat, prop, &val, 4, create);
+	fdt32_t tmp = cpu_to_fdt32(val);
+	do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
 }
 
 /*
@@ -366,7 +366,7 @@ void do_fixup_by_compat_u32(void *fdt, const char *compat,
  */
 static int get_cells_len(void *blob, char *nr_cells_name)
 {
-	const u32 *cell;
+	const fdt32_t *cell;
 
 	cell = fdt_getprop(blob, 0, nr_cells_name, NULL);
 	if (cell && fdt32_to_cpu(*cell) == 2)
@@ -387,13 +387,21 @@ static void write_cell(u8 *addr, u64 val, int size)
 	}
 }
 
+#define MEMORY_BANKS_MAX 4
 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
 {
 	int err, nodeoffset;
 	int addr_cell_len, size_cell_len, len;
-	u8 tmp[banks * 16]; /* Up to 64-bit address + 64-bit size */
+	u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */
 	int bank;
 
+	if (banks > MEMORY_BANKS_MAX) {
+		printf("%s: num banks %d exceeds hardcoded limit %d."
+		       " Recompile with higher MEMORY_BANKS_MAX?\n",
+		       __FUNCTION__, banks, MEMORY_BANKS_MAX);
+		return -1;
+	}
+
 	err = fdt_check_header(blob);
 	if (err < 0) {
 		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
@@ -902,11 +910,11 @@ void fdt_del_node_and_alias(void *blob, const char *alias)
 }
 
 /* Helper to read a big number; size is in cells (not bytes) */
-static inline u64 of_read_number(const __be32 *cell, int size)
+static inline u64 of_read_number(const fdt32_t *cell, int size)
 {
 	u64 r = 0;
 	while (size--)
-		r = (r << 32) | be32_to_cpu(*(cell++));
+		r = (r << 32) | fdt32_to_cpu(*(cell++));
 	return r;
 }
 
@@ -920,7 +928,7 @@ static inline u64 of_read_number(const __be32 *cell, int size)
 
 /* Debug utility */
 #ifdef DEBUG
-static void of_dump_addr(const char *s, const u32 *addr, int na)
+static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
 {
 	printf("%s", s);
 	while(na--)
@@ -928,7 +936,7 @@ static void of_dump_addr(const char *s, const u32 *addr, int na)
 	printf("\n");
 }
 #else
-static void of_dump_addr(const char *s, const u32 *addr, int na) { }
+static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
 #endif
 
 /* Callbacks for bus specific translators */
@@ -937,21 +945,21 @@ struct of_bus {
 	const char	*addresses;
 	void		(*count_cells)(void *blob, int parentoffset,
 				int *addrc, int *sizec);
-	u64		(*map)(u32 *addr, const u32 *range,
+	u64		(*map)(fdt32_t *addr, const fdt32_t *range,
 				int na, int ns, int pna);
-	int		(*translate)(u32 *addr, u64 offset, int na);
+	int		(*translate)(fdt32_t *addr, u64 offset, int na);
 };
 
 /* Default translator (generic bus) */
 static void of_bus_default_count_cells(void *blob, int parentoffset,
 					int *addrc, int *sizec)
 {
-	const u32 *prop;
+	const fdt32_t *prop;
 
 	if (addrc) {
 		prop = fdt_getprop(blob, parentoffset, "#address-cells", NULL);
 		if (prop)
-			*addrc = be32_to_cpup((u32 *)prop);
+			*addrc = be32_to_cpup(prop);
 		else
 			*addrc = 2;
 	}
@@ -959,13 +967,13 @@ static void of_bus_default_count_cells(void *blob, int parentoffset,
 	if (sizec) {
 		prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
 		if (prop)
-			*sizec = be32_to_cpup((u32 *)prop);
+			*sizec = be32_to_cpup(prop);
 		else
 			*sizec = 1;
 	}
 }
 
-static u64 of_bus_default_map(u32 *addr, const u32 *range,
+static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
 		int na, int ns, int pna)
 {
 	u64 cp, s, da;
@@ -982,14 +990,14 @@ static u64 of_bus_default_map(u32 *addr, const u32 *range,
 	return da - cp;
 }
 
-static int of_bus_default_translate(u32 *addr, u64 offset, int na)
+static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
 {
 	u64 a = of_read_number(addr, na);
 	memset(addr, 0, na * 4);
 	a += offset;
 	if (na > 1)
-		addr[na - 2] = a >> 32;
-	addr[na - 1] = a & 0xffffffffu;
+		addr[na - 2] = cpu_to_fdt32(a >> 32);
+	addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);
 
 	return 0;
 }
@@ -1007,10 +1015,10 @@ static struct of_bus of_busses[] = {
 };
 
 static int of_translate_one(void * blob, int parent, struct of_bus *bus,
-			    struct of_bus *pbus, u32 *addr,
+			    struct of_bus *pbus, fdt32_t *addr,
 			    int na, int ns, int pna, const char *rprop)
 {
-	const u32 *ranges;
+	const fdt32_t *ranges;
 	int rlen;
 	int rone;
 	u64 offset = OF_BAD_ADDR;
@@ -1027,7 +1035,7 @@ static int of_translate_one(void * blob, int parent, struct of_bus *bus,
 	 * to translate addresses that aren't supposed to be translated in
 	 * the first place. --BenH.
 	 */
-	ranges = (u32 *)fdt_getprop(blob, parent, rprop, &rlen);
+	ranges = fdt_getprop(blob, parent, rprop, &rlen);
 	if (ranges == NULL || rlen == 0) {
 		offset = of_read_number(addr, na);
 		memset(addr, 0, pna * 4);
@@ -1069,12 +1077,12 @@ static int of_translate_one(void * blob, int parent, struct of_bus *bus,
  * that can be mapped to a cpu physical address). This is not really specified
  * that way, but this is traditionally the way IBM at least do things
  */
-u64 __of_translate_address(void *blob, int node_offset, const u32 *in_addr,
-			   const char *rprop)
+static u64 __of_translate_address(void *blob, int node_offset, const fdt32_t *in_addr,
+				  const char *rprop)
 {
 	int parent;
 	struct of_bus *bus, *pbus;
-	u32 addr[OF_MAX_ADDR_CELLS];
+	fdt32_t addr[OF_MAX_ADDR_CELLS];
 	int na, ns, pna, pns;
 	u64 result = OF_BAD_ADDR;
 
@@ -1142,7 +1150,7 @@ u64 __of_translate_address(void *blob, int node_offset, const u32 *in_addr,
 	return result;
 }
 
-u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr)
+u64 fdt_translate_address(void *blob, int node_offset, const fdt32_t *in_addr)
 {
 	return __of_translate_address(blob, node_offset, in_addr, "ranges");
 }
@@ -1161,7 +1169,7 @@ int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
 {
 	int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
 	while (off != -FDT_ERR_NOTFOUND) {
-		u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", &len);
+		const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
 		if (reg) {
 			if (compat_off == fdt_translate_address(blob, off, reg))
 				return off;
@@ -1355,7 +1363,7 @@ err_size:
 int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
 {
 	const char *path;
-	const u32 *reg;
+	const fdt32_t *reg;
 	int node, len;
 	u64 dt_addr;
 
@@ -1397,11 +1405,11 @@ u64 fdt_get_base_address(void *fdt, int node)
 {
 	int size;
 	u32 naddr;
-	const u32 *prop;
+	const fdt32_t *prop;
 
 	prop = fdt_getprop(fdt, node, "#address-cells", &size);
 	if (prop && size == 4)
-		naddr = *prop;
+		naddr = be32_to_cpup(prop);
 	else
 		naddr = 2;
 

include/fdt_support.h

@@ -93,7 +93,7 @@ int fdt_fixup_nor_flash_size(void *blob);
 
 void fdt_fixup_mtdparts(void *fdt, void *node_info, int node_info_size);
 void fdt_del_node_and_alias(void *blob, const char *alias);
-u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr);
+u64 fdt_translate_address(void *blob, int node_offset, const __be32 *in_addr);
 int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
 					phys_addr_t compat_off);
 int fdt_alloc_phandle(void *blob);