diff options
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efivars.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 37ac21a08751..bee14cc47c03 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -784,7 +784,51 @@ static int efi_pstore_write(enum pstore_type_id type, static int efi_pstore_erase(enum pstore_type_id type, u64 id, struct pstore_info *psi) { - efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); + char stub_name[DUMP_NAME_LEN]; + efi_char16_t efi_name[DUMP_NAME_LEN]; + efi_guid_t vendor = LINUX_EFI_CRASH_GUID; + struct efivars *efivars = psi->data; + struct efivar_entry *entry, *found = NULL; + int i; + + sprintf(stub_name, "dump-type%u-%u-", type, (unsigned int)id); + + spin_lock(&efivars->lock); + + for (i = 0; i < DUMP_NAME_LEN; i++) + efi_name[i] = stub_name[i]; + + /* + * Clean up any entries with the same name + */ + + list_for_each_entry(entry, &efivars->list, list) { + get_var_data_locked(efivars, &entry->var); + + if (efi_guidcmp(entry->var.VendorGuid, vendor)) + continue; + if (utf16_strncmp(entry->var.VariableName, efi_name, + utf16_strlen(efi_name))) + continue; + /* Needs to be a prefix */ + if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) + continue; + + /* found */ + found = entry; + efivars->ops->set_variable(entry->var.VariableName, + &entry->var.VendorGuid, + PSTORE_EFI_ATTRIBUTES, + 0, NULL); + } + + if (found) + list_del(&found->list); + + spin_unlock(&efivars->lock); + + if (found) + efivar_unregister(found); return 0; } |