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| author | Jean-Philippe Brucker <jean-philippe.brucker@arm.com> | 2019-06-10 20:38:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-06 20:06:48 +0300 |
| commit | cdee3f53510a65c07b98e18a534c69b62027eb96 (patch) | |
| tree | 8c73ec909875a7e3e9b711563ef5ef92cd177d81 /drivers/firmware | |
| parent | 09ec6c6783ff0414cfb85798b3f08bd8c3493314 (diff) | |
| download | linux-cdee3f53510a65c07b98e18a534c69b62027eb96.tar.xz | |
firmware/psci: psci_checker: Park kthreads before stopping them
[ Upstream commit 92e074acf6f7694e96204265eb18ac113f546e80 ]
Since commit 85f1abe0019f ("kthread, sched/wait: Fix kthread_parkme()
completion issue"), kthreads that are bound to a CPU must be parked
before being stopped. At the moment the PSCI checker calls
kthread_stop() directly on the suspend kthread, which triggers the
following warning:
[ 6.068288] WARNING: CPU: 1 PID: 1 at kernel/kthread.c:398 __kthread_bind_mask+0x20/0x78
...
[ 6.190151] Call trace:
[ 6.192566] __kthread_bind_mask+0x20/0x78
[ 6.196615] kthread_unpark+0x74/0x80
[ 6.200235] kthread_stop+0x44/0x1d8
[ 6.203769] psci_checker+0x3bc/0x484
[ 6.207389] do_one_initcall+0x48/0x260
[ 6.211180] kernel_init_freeable+0x2c8/0x368
[ 6.215488] kernel_init+0x10/0x100
[ 6.218935] ret_from_fork+0x10/0x1c
[ 6.222467] ---[ end trace e05e22863d043cd3 ]---
kthread_unpark() tries to bind the thread to its CPU and aborts with a
WARN() if the thread wasn't in TASK_PARKED state. Park the kthreads
before stopping them.
Fixes: 85f1abe0019f ("kthread, sched/wait: Fix kthread_parkme() completion issue")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/psci_checker.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/firmware/psci_checker.c b/drivers/firmware/psci_checker.c index 346943657962..cbd53cb1b2d4 100644 --- a/drivers/firmware/psci_checker.c +++ b/drivers/firmware/psci_checker.c @@ -366,16 +366,16 @@ static int suspend_test_thread(void *arg) for (;;) { /* Needs to be set first to avoid missing a wakeup. */ set_current_state(TASK_INTERRUPTIBLE); - if (kthread_should_stop()) { - __set_current_state(TASK_RUNNING); + if (kthread_should_park()) break; - } schedule(); } pr_info("CPU %d suspend test results: success %d, shallow states %d, errors %d\n", cpu, nb_suspend, nb_shallow_sleep, nb_err); + kthread_parkme(); + return nb_err; } @@ -440,8 +440,10 @@ static int suspend_tests(void) /* Stop and destroy all threads, get return status. */ - for (i = 0; i < nb_threads; ++i) + for (i = 0; i < nb_threads; ++i) { + err += kthread_park(threads[i]); err += kthread_stop(threads[i]); + } out: cpuidle_resume_and_unlock(); kfree(threads); |