powerpc/opal: Add opal_async_wait_response_interruptible() to opal-async

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This patch adds an _interruptible version of opal_async_wait_response().
This is useful when a long running OPAL call is performed on behalf of
a userspace thread, for example, the opal_flash_{read,write,erase}
functions performed by the powernv-flash MTD driver.

It is foreseeable that these functions would take upwards of two
minutes causing the wait_event() to block long enough to cause hung
task warnings. Furthermore, wait_event_interruptible() is preferable
as otherwise there is no way for signals to stop the process which is
going to be confusing in userspace.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Cyril Bur 2017-11-03 13:41:44 +11:00 • committed by Michael Ellerman

parent 95e1bc1daa

commit 9aab24495c

2 changed files with 82 additions and 4 deletions

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arch/powerpc/include/asm/opal.h

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84

arch/powerpc/platforms/powernv/opal-async.c

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