• Jean-Philippe Brucker's avatar
    firmware/psci: psci_checker: Park kthreads before stopping them · 92e074ac
    Jean-Philippe Brucker authored
    Since commit 85f1abe0 ("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: 85f1abe0 ("kthread, sched/wait: Fix kthread_parkme() completion issue")
    Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe.brucker@arm.com>
    Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
    Acked-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
    Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
    92e074ac
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