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(parent: 06755a8) | patch
powerpc: get_wchan(): solve possible race scenario due to parallel wakeup
authorKautuk Consul <kautuk.consul.1980@gmail.com>
Tue, 19 Apr 2016 10:18:21 +0000 (15:48 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Fri, 6 Oct 2017 09:51:52 +0000 (20:51 +1100)
commit4ca360f3dbf2036d964cdf3a6c4a45a81fdf8e18
tree410ee4122e075d177af46e049efa823b6b9f02b9tree | snapshot
parent06755a871314c7443a89c09650cdb3982466e1a8commit | diff
powerpc: get_wchan(): solve possible race scenario due to parallel wakeup

Add a check for p->state == TASK_RUNNING so that any wake-ups on
task_struct p in the interim lead to 0 being returned by get_wchan().

Signed-off-by: Kautuk Consul <kautuk.consul.1980@gmail.com>
[mpe: Confirmed other architectures do similar]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/process.c diff | blob | history
Linux Kernel Source Tree.