forked from Minki/linux
Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
Pull dmi subsystem updates/fixes from Jean Delvare. * 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: firmware: dmi: handle missing DMI data gracefully firmware: dmi_scan: Fix handling of empty DMI strings firmware: dmi_scan: Drop dmi_initialized firmware: dmi: Optimize dmi_matches
This commit is contained in:
Linus Torvalds
commit
85b8bac957
@ -652,7 +652,7 @@ static int __init dmi_sysfs_init(void)
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int val;
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if (!dmi_kobj) {
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pr_err("dmi-sysfs: dmi entry is absent.\n");
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pr_debug("dmi-sysfs: dmi entry is absent.\n");
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error = -ENODATA;
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goto err;
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}
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@ -18,7 +18,7 @@ EXPORT_SYMBOL_GPL(dmi_kobj);
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* of and an antecedent to, SMBIOS, which stands for System
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* Management BIOS. See further: http://www.dmtf.org/standards
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*/
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static const char dmi_empty_string[] = " ";
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static const char dmi_empty_string[] = "";
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static u32 dmi_ver __initdata;
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static u32 dmi_len;
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@ -26,11 +26,6 @@ static u16 dmi_num;
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static u8 smbios_entry_point[32];
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static int smbios_entry_point_size;
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/*
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* Catch too early calls to dmi_check_system():
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*/
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static int dmi_initialized;
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/* DMI system identification string used during boot */
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static char dmi_ids_string[128] __initdata;
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@ -44,25 +39,21 @@ static int dmi_memdev_nr;
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static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
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{
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const u8 *bp = ((u8 *) dm) + dm->length;
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const u8 *nsp;
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if (s) {
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s--;
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while (s > 0 && *bp) {
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while (--s > 0 && *bp)
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bp += strlen(bp) + 1;
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s--;
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}
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if (*bp != 0) {
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size_t len = strlen(bp)+1;
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size_t cmp_len = len > 8 ? 8 : len;
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if (!memcmp(bp, dmi_empty_string, cmp_len))
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return dmi_empty_string;
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/* Strings containing only spaces are considered empty */
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nsp = bp;
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while (*nsp == ' ')
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nsp++;
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if (*nsp != '\0')
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return bp;
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}
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}
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return "";
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return dmi_empty_string;
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}
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static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
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@ -633,7 +624,7 @@ void __init dmi_scan_machine(void)
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if (!dmi_smbios3_present(buf)) {
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dmi_available = 1;
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goto out;
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return;
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}
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}
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if (efi.smbios == EFI_INVALID_TABLE_ADDR)
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@ -651,7 +642,7 @@ void __init dmi_scan_machine(void)
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if (!dmi_present(buf)) {
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dmi_available = 1;
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goto out;
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return;
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}
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} else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
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p = dmi_early_remap(0xF0000, 0x10000);
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@ -668,7 +659,7 @@ void __init dmi_scan_machine(void)
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if (!dmi_smbios3_present(buf)) {
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dmi_available = 1;
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dmi_early_unmap(p, 0x10000);
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goto out;
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return;
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}
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memcpy(buf, buf + 16, 16);
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}
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@ -686,7 +677,7 @@ void __init dmi_scan_machine(void)
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if (!dmi_present(buf)) {
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dmi_available = 1;
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dmi_early_unmap(p, 0x10000);
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goto out;
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return;
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}
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memcpy(buf, buf + 16, 16);
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}
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@ -694,8 +685,6 @@ void __init dmi_scan_machine(void)
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}
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error:
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pr_info("DMI not present or invalid.\n");
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out:
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dmi_initialized = 1;
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}
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static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
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@ -715,10 +704,8 @@ static int __init dmi_init(void)
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u8 *dmi_table;
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int ret = -ENOMEM;
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if (!dmi_available) {
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ret = -ENODATA;
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goto err;
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}
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if (!dmi_available)
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return 0;
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/*
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* Set up dmi directory at /sys/firmware/dmi. This entry should stay
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@ -784,20 +771,21 @@ static bool dmi_matches(const struct dmi_system_id *dmi)
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{
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int i;
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WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
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for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
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int s = dmi->matches[i].slot;
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if (s == DMI_NONE)
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break;
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if (dmi_ident[s]) {
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if (!dmi->matches[i].exact_match &&
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strstr(dmi_ident[s], dmi->matches[i].substr))
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if (dmi->matches[i].exact_match) {
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if (!strcmp(dmi_ident[s],
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dmi->matches[i].substr))
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continue;
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else if (dmi->matches[i].exact_match &&
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!strcmp(dmi_ident[s], dmi->matches[i].substr))
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} else {
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if (strstr(dmi_ident[s],
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dmi->matches[i].substr))
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continue;
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}
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}
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/* No match */
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return false;
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@ -826,6 +814,8 @@ static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
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* Walk the blacklist table running matching functions until someone
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* returns non zero or we hit the end. Callback function is called for
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* each successful match. Returns the number of matches.
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*
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* dmi_scan_machine must be called before this function is called.
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*/
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int dmi_check_system(const struct dmi_system_id *list)
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{
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@ -854,6 +844,8 @@ EXPORT_SYMBOL(dmi_check_system);
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*
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* Walk the blacklist table until the first match is found. Return the
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* pointer to the matching entry or NULL if there's no match.
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*
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* dmi_scan_machine must be called before this function is called.
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*/
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const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
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{
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