[PATCH AUTOSEL 4.19 01/60] soc: brcmstb: Fix error path for unsupported CPUs

Sasha Levin
2019-06-27T00:36:24Z

From: Florian Fainelli <f.fainelli@gmail.com>

[ Upstream commit 490cad5a3ad6ef0bfd3168a5063140b982f3b22a ]

In case setup_hifcpubiuctrl_regs() returns an error, because of e.g:
an unsupported CPU type, just catch that error and return instead of
blindly continuing with the initialization. This fixes a NULL pointer
de-reference with the code continuing without having a proper array of
registers to use.

Fixes: 22f7a9116eba ("soc: brcmstb: Correct CPU_CREDIT_REG offset for Brahma-B53 CPUs")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/soc/bcm/brcmstb/biuctrl.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
index 6d89ebf13b8a..c16273b31b94 100644
--- a/drivers/soc/bcm/brcmstb/biuctrl.c
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -246,7 +246,9 @@ static int __init brcmstb_biuctrl_init(void)
if (!np)
return 0;

- setup_hifcpubiuctrl_regs(np);
+ ret = setup_hifcpubiuctrl_regs(np);
+ if (ret)
+ return ret;

ret = mcp_write_pairing_set();
if (ret) {
--
2.20.1