[PATCH] riscv/efi_stub: Fix get_boot_hartid_from_fdt() return value

Sunil V L
2022-01-28T04:50:20Z

The get_boot_hartid_from_fdt() function currently returns U32_MAX
for failure case which is not correct because U32_MAX is a valid
hartid value. This patch fixes the issue by returning error code.

Fixes: d7071743db31 ("RISC-V: Add EFI stub support.")
Cc: stable@vger.kernel.org

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
drivers/firmware/efi/libstub/riscv-stub.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c
index 380e4e251399..9c460843442f 100644
--- a/drivers/firmware/efi/libstub/riscv-stub.c
+++ b/drivers/firmware/efi/libstub/riscv-stub.c
@@ -25,7 +25,7 @@ typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long);

static u32 hartid;

-static u32 get_boot_hartid_from_fdt(void)
+static int get_boot_hartid_from_fdt(void)
{
const void *fdt;
int chosen_node, len;
@@ -33,23 +33,26 @@ static u32 get_boot_hartid_from_fdt(void)

fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
- return U32_MAX;
+ return -EINVAL;

chosen_node = fdt_path_offset(fdt, "/chosen");
if (chosen_node < 0)
- return U32_MAX;
+ return -EINVAL;

prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
if (!prop || len != sizeof(u32))
- return U32_MAX;
+ return -EINVAL;

- return fdt32_to_cpu(*prop);
+ hartid = fdt32_to_cpu(*prop);
+ return 0;
}

efi_status_t check_platform_features(void)
{
- hartid = get_boot_hartid_from_fdt();
- if (hartid == U32_MAX) {
+ int ret;
+
+ ret = get_boot_hartid_from_fdt();
+ if (ret) {
efi_err("/chosen/boot-hartid missing or invalid!\n");
return EFI_UNSUPPORTED;
}
--
2.25.1