Commit e1aa1dfe authored by Jiaxun Yang's avatar Jiaxun Yang Committed by Thomas Bogendoerfer
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MIPS: mips-cm: Check availability of config registers 



Prevent reading unsupported config register during probing process.

Signed-off-by: default avatarJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent aa45787c

arch/mips/kernel/mips-cm.c

+7 −2
Original line number Diff line number Diff line
@@ -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 */