Prevent reading unsupported config register during probing process.
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
arch/mips/kernel/mips-cm.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/mips/kernel/mips-cm.c b/arch/mips/kernel/mips-cm.c
index b4f7d950c846..3f00788b0871 100644
--- a/arch/mips/kernel/mips-cm.c
+++ b/arch/mips/kernel/mips-cm.c
@@ -181,11 +181,16 @@ static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags);
phys_addr_t __mips_cm_phys_base(void)
{
- u32 config3 = read_c0_config3();
unsigned long cmgcr;
/* Check the CMGCRBase register is implemented */
- if (!(config3 & MIPS_CONF3_CMGCR))
+ if (!(read_c0_config() & MIPS_CONF_M))
+ return 0;
+
+ if (!(read_c0_config2() & MIPS_CONF_M))
+ return 0;
+
+ if (!(read_c0_config3() & MIPS_CONF3_CMGCR))
return 0;
/* Read the address from CMGCRBase */
--
2.37.1 (Apple Git-137.1)
