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authorHeiko Carstens <heiko.carstens@de.ibm.com>2011-05-26 11:48:23 +0400
committerHeiko Carstens <heiko.carstens@de.ibm.com>2011-05-26 11:48:24 +0400
commitdf7997ab1ca82ae3c37a2f5eb98613fc24527f95 (patch)
tree51794f46cb7fc7fa4db8fbadb8feb265fc8ef499 /drivers/s390/block/dasd_diag.c
parent902050bcdece6191565c055539e82c5cc534feed (diff)
downloadlinux-df7997ab1ca82ae3c37a2f5eb98613fc24527f95.tar.xz
[S390] irq: fix service signal external interrupt handling
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>
Diffstat (limited to 'drivers/s390/block/dasd_diag.c')
-rw-r--r--drivers/s390/block/dasd_diag.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 85dddb1e4126..5e8e82db1886 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -642,7 +642,7 @@ dasd_diag_init(void)
}
ASCEBC(dasd_diag_discipline.ebcname, 4);
- ctl_set_bit(0, 9);
+ service_subclass_irq_register();
register_external_interrupt(0x2603, dasd_ext_handler);
dasd_diag_discipline_pointer = &dasd_diag_discipline;
return 0;
@@ -652,7 +652,7 @@ static void __exit
dasd_diag_cleanup(void)
{
unregister_external_interrupt(0x2603, dasd_ext_handler);
- ctl_clear_bit(0, 9);
+ service_subclass_irq_unregister();
dasd_diag_discipline_pointer = NULL;
}