Commit 1e227724 authored Jun 23, 2018 by Prasad Sodagudi

cpu-hotplug: Fix the cpus_write_lock usage



'Commit ("5f7b7a9f cpu-hotplug:
Keep atleast 1 online and un-isolated CPU")'
caused regression in CPU hotplug scenario. cpus_write_lock
taken and not released in error path. So fix
the sequence of checks in _cpu_down function.

Change-Id: I96cb3c2f1de93992af0e4f1d85857744b65e7a21
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>

parent c3179e5f

kernel/cpu.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -867,11 +867,11 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen,
		if (!cpu_present(cpu))
		return -EINVAL;

		cpus_write_lock();

		if (!tasks_frozen && !cpu_isolated(cpu) && num_online_uniso_cpus() == 1)
		return -EBUSY;

		cpus_write_lock();

		if (trace_cpuhp_latency_enabled())
		start_time = sched_clock();