diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-12-05 11:04:51 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-12-06 11:51:03 +0000 |
| commit | 04bb96427d4ee33fbdf15648ddf578c6ba1aef54 (patch) | |
| tree | f68ba6c7c2e8fdc5825412c5787cb9c1cb432413 /arch/arm | |
| parent | ff98a5f624d2910de050f1fc7f2a32769da86b51 (diff) | |
ARM: 8947/1: Fix __arch_get_hw_counter() access to CNTVCT
__arch_get_hw_counter() should check clock_mode to see if it can access
CNTVCT. With the conversion to unified vDSO this check has been left out.
This causes on imx v6 and v7 (imx_v6_v7_defconfig) and other platforms to
hang at boot during the execution of the init process as per below:
[ 19.976852] Run /sbin/init as init process
[ 20.044931] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000004
Fix the problem verifying that clock_mode is set coherently before
accessing CNTVCT.
Investigated-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/vdso/gettimeofday.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vdso/gettimeofday.h b/arch/arm/include/asm/vdso/gettimeofday.h index 5b879ae7afc1..0ad2429c324f 100644 --- a/arch/arm/include/asm/vdso/gettimeofday.h +++ b/arch/arm/include/asm/vdso/gettimeofday.h @@ -75,6 +75,9 @@ static __always_inline u64 __arch_get_hw_counter(int clock_mode) #ifdef CONFIG_ARM_ARCH_TIMER u64 cycle_now; + if (!clock_mode) + return -EINVAL; + isb(); cycle_now = read_sysreg(CNTVCT); |