Before moving 'current' pointer during ACPI table writing, we always check the table length to see if it is larger than the table header. Since our purpose is to generate valid tables, the check logic is always true, which can be avoided.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
---
Changes in v2: - New patch to remove header length check when writing tables
arch/x86/lib/acpi_table.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-)
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c index 05c958d..f959f5d 100644 --- a/arch/x86/lib/acpi_table.c +++ b/arch/x86/lib/acpi_table.c @@ -376,13 +376,11 @@ u32 write_acpi_tables(u32 start) debug("ACPI: * DSDT\n"); dsdt = (struct acpi_table_header *)current; memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header)); - if (dsdt->length >= sizeof(struct acpi_table_header)) { - current += sizeof(struct acpi_table_header); - memcpy((char *)current, - (char *)&AmlCode + sizeof(struct acpi_table_header), - dsdt->length - sizeof(struct acpi_table_header)); - current += dsdt->length - sizeof(struct acpi_table_header); - } + current += sizeof(struct acpi_table_header); + memcpy((char *)current, + (char *)&AmlCode + sizeof(struct acpi_table_header), + dsdt->length - sizeof(struct acpi_table_header)); + current += dsdt->length - sizeof(struct acpi_table_header); current = ALIGN(current, 16);
debug("ACPI: * FADT\n"); @@ -395,20 +393,16 @@ u32 write_acpi_tables(u32 start) debug("ACPI: * MADT\n"); madt = (struct acpi_madt *)current; acpi_create_madt(madt); - if (madt->header.length > sizeof(struct acpi_madt)) { - current += madt->header.length; - acpi_add_table(rsdp, madt); - } + current += madt->header.length; + acpi_add_table(rsdp, madt); current = ALIGN(current, 16);
debug("ACPI: * MCFG\n"); mcfg = (struct acpi_mcfg *)current; acpi_create_mcfg(mcfg); - if (mcfg->header.length > sizeof(struct acpi_mcfg)) { - current += mcfg->header.length; - current = ALIGN(current, 16); - acpi_add_table(rsdp, mcfg); - } + current += mcfg->header.length; + acpi_add_table(rsdp, mcfg); + current = ALIGN(current, 16);
debug("current = %x\n", current);