[S390] cio/crw: add/fix locking

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The crw_unregister_handler uses xchg + synchronize_sched when
unregistering a crw_handler.
This doesn't protect crw_collect_info to potentially jump to NULL since
it has unlocked code like this:

if (crw_handlers[i])
        crw_handlers[i](NULL, NULL, 1);

So add a mutex which protects the crw handler array for changes.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Heiko Carstens 2009-03-26 15:24:09 +01:00 • committed by Martin Schwidefsky

parent e74fe0cec9

commit 98c1c68252

1 changed files with 23 additions and 9 deletions

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32

drivers/s390/cio/crw.c

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