drm/radeon/ci: make sure mc ucode is loaded before checking the size

commit bcddee29b0b87af3aeda953840f97b356b24dc5e upstream.

Avoid a possible segfault.

Noticed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index f72a28e..8e8a056 100644 (file)
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -1704,11 +1704,13 @@ int ci_mc_load_microcode(struct radeon_device *rdev)
        const __be32 *fw_data;
        u32 running, blackout = 0;
        u32 *io_mc_regs;
-       int i, regs_size, ucode_size = rdev->mc_fw->size / 4;
+       int i, regs_size, ucode_size;
 
        if (!rdev->mc_fw)
                return -EINVAL;
 
+       ucode_size = rdev->mc_fw->size / 4;
+
        switch (rdev->family) {
        case CHIP_BONAIRE:
                io_mc_regs = (u32 *)&bonaire_io_mc_regs;