powerpc/kernel: Block interrupts when updating TIDR

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clear_thread_tidr() is called in interrupt context as a part of delayed
put of the task structure (i.e as a part of timer interrupt). To prevent
a deadlock, block interrupts when holding vas_thread_id_lock to set/
clear TIDR for a task.

Fixes: ec233ede4c ("powerpc: Add support for setting SPRN_TIDR")
Cc: stable@vger.kernel.org # v4.15+
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Sukadev Bhattiprolu 2017-11-28 13:39:43 -06:00 • committed by Michael Ellerman

parent 902bdc5745

commit 384dfd627f

1 changed files with 9 additions and 6 deletions

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arch/powerpc/kernel/process.c

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