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arm64: smp: Handle errors reported by the firmware

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The __cpu_up() routine ignores the errors reported by the firmware
for a CPU bringup operation and looks for the error status set by the
booting CPU. If the CPU never entered the kernel, we could end up
in assuming stale error status, which otherwise would have been
set/cleared appropriately by the booting CPU.

Reported-by: Steve Capper <steve.capper@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose 2018-12-10 18:07:33 +00:00 committed by Will Deacon
parent 66f16a2451
commit f357b3a7e1
1 changed files with 1 additions and 0 deletions
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arch/arm64/kernel/smp.c
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@ -141,6 +141,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
}
} else {
pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
return ret;
}
secondary_data.task = NULL;