df7997ab1c
Interrupt sources like pfault, sclp, dasd_diag and virtio all use the service signal external interrupt subclass mask in control register 0 to enable and disable the corresponding interrupt. Because no reference counting is implemented each subsystem thinks it is the only user of subclass and sets and clears the bit like it wants. This leads to case that unloading the dasd diag module under z/VM causes both sclp and pfault interrupts to be masked. The result will be locked up system sooner or later. Fix this by introducing a new way to set (register) and clear (unregister) the service signal subclass mask bit in cr0. Also convert all drivers. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
19 lines
572 B
C
19 lines
572 B
C
/*
|
|
* Copyright IBM Corp. 1999,2010
|
|
* Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
|
|
* Martin Schwidefsky <schwidefsky@de.ibm.com>,
|
|
*/
|
|
|
|
#ifndef _S390_EXTINT_H
|
|
#define _S390_EXTINT_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
typedef void (*ext_int_handler_t)(unsigned int, unsigned int, unsigned long);
|
|
|
|
int register_external_interrupt(__u16 code, ext_int_handler_t handler);
|
|
int unregister_external_interrupt(__u16 code, ext_int_handler_t handler);
|
|
void service_subclass_irq_register(void);
|
|
void service_subclass_irq_unregister(void);
|
|
|
|
#endif /* _S390_EXTINT_H */
|