From 1855256c497ecfefc730df6032243f26855ce52c Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Wed, 3 Oct 2007 15:15:40 -0400 Subject: drivers/firmware: const-ify DMI API and internals Three main sets of changes: 1) dmi_get_system_info() return value should have been marked const, since callers should not be changing that data. 2) const-ify DMI internals, since DMI firmware tables should, whenever possible, be marked const to ensure we never ever write to that data area. 3) const-ify DMI API, to enable marking tables const where possible in low-level drivers. And if we're really lucky, this might enable some additional optimizations on the part of the compiler. The bulk of the changes are #2 and #3, which are interrelated. #1 could have been a separate patch, but it was so small compared to the others, it was easier to roll it into this changeset. Signed-off-by: Jeff Garzik --- drivers/firmware/dmi_scan.c | 57 ++++++++++++++++++++++++--------------------- 1 file changed, 31 insertions(+), 26 deletions(-) (limited to 'drivers/firmware/dmi_scan.c') diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index f7318b3b51f..0cdadea7a40 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -8,9 +8,9 @@ #include #include -static char * __init dmi_string(struct dmi_header *dm, u8 s) +static char * __init dmi_string(const struct dmi_header *dm, u8 s) { - u8 *bp = ((u8 *) dm) + dm->length; + const u8 *bp = ((u8 *) dm) + dm->length; char *str = ""; if (s) { @@ -37,7 +37,7 @@ static char * __init dmi_string(struct dmi_header *dm, u8 s) * pointing to completely the wrong place for example */ static int __init dmi_table(u32 base, int len, int num, - void (*decode)(struct dmi_header *)) + void (*decode)(const struct dmi_header *)) { u8 *buf, *data; int i = 0; @@ -53,7 +53,8 @@ static int __init dmi_table(u32 base, int len, int num, * OR we run off the end of the table (also happens) */ while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { - struct dmi_header *dm = (struct dmi_header *)data; + const struct dmi_header *dm = (const struct dmi_header *)data; + /* * We want to know the total length (formated area and strings) * before decoding to make sure we won't run off the table in @@ -71,7 +72,7 @@ static int __init dmi_table(u32 base, int len, int num, return 0; } -static int __init dmi_checksum(u8 *buf) +static int __init dmi_checksum(const u8 *buf) { u8 sum = 0; int a; @@ -89,9 +90,10 @@ int dmi_available; /* * Save a DMI string */ -static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string) +static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string) { - char *p, *d = (char*) dm; + const char *d = (const char*) dm; + char *p; if (dmi_ident[slot]) return; @@ -103,9 +105,9 @@ static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string) dmi_ident[slot] = p; } -static void __init dmi_save_uuid(struct dmi_header *dm, int slot, int index) +static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index) { - u8 *d = (u8*) dm + index; + const u8 *d = (u8*) dm + index; char *s; int is_ff = 1, is_00 = 1, i; @@ -132,9 +134,9 @@ static void __init dmi_save_uuid(struct dmi_header *dm, int slot, int index) dmi_ident[slot] = s; } -static void __init dmi_save_type(struct dmi_header *dm, int slot, int index) +static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index) { - u8 *d = (u8*) dm + index; + const u8 *d = (u8*) dm + index; char *s; if (dmi_ident[slot]) @@ -148,13 +150,13 @@ static void __init dmi_save_type(struct dmi_header *dm, int slot, int index) dmi_ident[slot] = s; } -static void __init dmi_save_devices(struct dmi_header *dm) +static void __init dmi_save_devices(const struct dmi_header *dm) { int i, count = (dm->length - sizeof(struct dmi_header)) / 2; struct dmi_device *dev; for (i = 0; i < count; i++) { - char *d = (char *)(dm + 1) + (i * 2); + const char *d = (char *)(dm + 1) + (i * 2); /* Skip disabled device */ if ((*d & 0x80) == 0) @@ -173,7 +175,7 @@ static void __init dmi_save_devices(struct dmi_header *dm) } } -static void __init dmi_save_oem_strings_devices(struct dmi_header *dm) +static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) { int i, count = *(u8 *)(dm + 1); struct dmi_device *dev; @@ -194,7 +196,7 @@ static void __init dmi_save_oem_strings_devices(struct dmi_header *dm) } } -static void __init dmi_save_ipmi_device(struct dmi_header *dm) +static void __init dmi_save_ipmi_device(const struct dmi_header *dm) { struct dmi_device *dev; void * data; @@ -225,7 +227,7 @@ static void __init dmi_save_ipmi_device(struct dmi_header *dm) * and machine entries. For 2.5 we should pull the smbus controller info * out of here. */ -static void __init dmi_decode(struct dmi_header *dm) +static void __init dmi_decode(const struct dmi_header *dm) { switch(dm->type) { case 0: /* BIOS Information */ @@ -265,9 +267,10 @@ static void __init dmi_decode(struct dmi_header *dm) } } -static int __init dmi_present(char __iomem *p) +static int __init dmi_present(const char __iomem *p) { u8 buf[15]; + memcpy_fromio(buf, p, 15); if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) { u16 num = (buf[13] << 8) | buf[12]; @@ -348,10 +351,10 @@ void __init dmi_scan_machine(void) * returns non zero or we hit the end. Callback function is called for * each successful match. Returns the number of matches. */ -int dmi_check_system(struct dmi_system_id *list) +int dmi_check_system(const struct dmi_system_id *list) { int i, count = 0; - struct dmi_system_id *d = list; + const struct dmi_system_id *d = list; while (d->ident) { for (i = 0; i < ARRAY_SIZE(d->matches); i++) { @@ -380,7 +383,7 @@ EXPORT_SYMBOL(dmi_check_system); * Returns one DMI data value, can be used to perform * complex DMI data checks. */ -char *dmi_get_system_info(int field) +const char *dmi_get_system_info(int field) { return dmi_ident[field]; } @@ -391,7 +394,7 @@ EXPORT_SYMBOL(dmi_get_system_info); * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information. * @str: Case sensitive Name */ -int dmi_name_in_vendors(char *str) +int dmi_name_in_vendors(const char *str) { static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR, DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR, @@ -418,13 +421,15 @@ EXPORT_SYMBOL(dmi_name_in_vendors); * A new search is initiated by passing %NULL as the @from argument. * If @from is not %NULL, searches continue from next device. */ -struct dmi_device * dmi_find_device(int type, const char *name, - struct dmi_device *from) +const struct dmi_device * dmi_find_device(int type, const char *name, + const struct dmi_device *from) { - struct list_head *d, *head = from ? &from->list : &dmi_devices; + const struct list_head *head = from ? &from->list : &dmi_devices; + struct list_head *d; for(d = head->next; d != &dmi_devices; d = d->next) { - struct dmi_device *dev = list_entry(d, struct dmi_device, list); + const struct dmi_device *dev = + list_entry(d, struct dmi_device, list); if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && ((name == NULL) || (strcmp(dev->name, name) == 0))) @@ -444,7 +449,7 @@ EXPORT_SYMBOL(dmi_find_device); int dmi_get_year(int field) { int year; - char *s = dmi_get_system_info(field); + const char *s = dmi_get_system_info(field); if (!s) return -1; -- cgit v1.2.3-70-g09d2