[PATCH 1/2] soc/tegra: fuse: Return -ENODEV for unsupported legacy SoCs

When booting without a FUSE device tree node, tegra_init_fuse() falls
back to legacy SoC detection on 32-bit ARM systems. If the detected chip
ID does not match any supported SoC, the default case only prints a
warning and breaks out of the switch statement.

In that case fuse->soc remains NULL, but initialization continues and
later calls fuse->soc->init(fuse), which results in a NULL pointer
dereference.

Return -ENODEV from the default case to stop initialization immediately
when the legacy fallback detects an unsupported SoC.

Fixes: 7e939de1b2bb ("soc/tegra: fuse: Unify Tegra20 and Tegra30 drivers")
Signed-off-by: Jinhui Guo <[email protected]>
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index 78b054d43a42..e539e6b595b0 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -520,7 +520,7 @@ static int __init tegra_init_fuse(void)
 
 			default:
 				pr_warn("Unsupported SoC: %02x\n", chip);
-				break;
+				return -ENODEV;
 			}
 		} else {
 			/*
-- 
2.20.1