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authorJan Glauber <jang@linux.vnet.ibm.com>2011-07-24 10:48:27 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-07-24 10:48:22 +0200
commit89c9b66b104549a8698e412bf6f4140c1d0786fb (patch)
treed7c62f412b1e99b2ebb5d37e8f86539b7dc03d9d /net/iucv
parent9e280f6693083baf1b7741c2b820be8d4109509e (diff)
downloadlinux-89c9b66b104549a8698e412bf6f4140c1d0786fb.tar.bz2
[S390] race safe external interrupt registration
The (un-)register_external_interrupt functions are not race safe if more than one interrupt handler is added or deleted for an external interrupt concurrently. Make the registration / unregistration of external interrupts race safe by using RCU and a spinlock. RCU is used to avoid a performance penalty in the external interrupt handler, the register and unregister functions are protected by the spinlock and are not performance critical. call_rcu must be used since the SCLP driver uses the interface with IRQs disabled. Also use the generic list implementation rather than homebrewn list code. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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