powerpc/pseries: avoid blocking in irq when queuing hotplug events

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A couple of bugs in queue_hotplug_event():

1. Unchecked kmalloc result which could lead to an oops.
2. Use of GFP_KERNEL allocations in interrupt context (this code's
   only caller is ras_hotplug_interrupt()).

Use kmemdup to avoid open-coding the allocation+copy and check for
failure; use GFP_ATOMIC for both allocations.

Ultimately it probably would be better to avoid or reduce allocations
in this path if possible.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nathan Lynch 2019-05-28 18:28:01 -05:00 • committed by Michael Ellerman

parent f474c28fbc

commit 348ea30f51

1 changed files with 4 additions and 4 deletions

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arch/powerpc/platforms/pseries/dlpar.c

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