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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2011-05-26 09:48:23 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2011-05-26 09:48:24 +0200 |
| commit | df7997ab1ca82ae3c37a2f5eb98613fc24527f95 (patch) | |
| tree | 51794f46cb7fc7fa4db8fbadb8feb265fc8ef499 /drivers/s390 | |
| parent | 902050bcdece6191565c055539e82c5cc534feed (diff) | |
| download | linux-3.10-df7997ab1ca82ae3c37a2f5eb98613fc24527f95.tar.gz linux-3.10-df7997ab1ca82ae3c37a2f5eb98613fc24527f95.tar.bz2 linux-3.10-df7997ab1ca82ae3c37a2f5eb98613fc24527f95.zip | |
[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')
| -rw-r--r-- | drivers/s390/block/dasd_diag.c | 4 | ||||
| -rw-r--r-- | drivers/s390/char/sclp.c | 6 | ||||
| -rw-r--r-- | drivers/s390/kvm/kvm_virtio.c | 2 |
3 files changed, 6 insertions, 6 deletions
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c index 85dddb1e412..5e8e82db188 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; } diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index b76c61f8248..b37b98cbbd0 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -885,12 +885,12 @@ sclp_check_interface(void) spin_unlock_irqrestore(&sclp_lock, flags); /* Enable service-signal interruption - needs to happen * with IRQs enabled. */ - ctl_set_bit(0, 9); + service_subclass_irq_register(); /* Wait for signal from interrupt or timeout */ sclp_sync_wait(); /* Disable service-signal interruption - needs to happen * with IRQs enabled. */ - ctl_clear_bit(0,9); + service_subclass_irq_unregister(); spin_lock_irqsave(&sclp_lock, flags); del_timer(&sclp_request_timer); if (sclp_init_req.status == SCLP_REQ_DONE && @@ -1070,7 +1070,7 @@ sclp_init(void) spin_unlock_irqrestore(&sclp_lock, flags); /* Enable service-signal external interruption - needs to happen with * IRQs enabled. */ - ctl_set_bit(0, 9); + service_subclass_irq_register(); sclp_init_mask(1); return 0; diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c index 607998f0b7d..724b5923b6e 100644 --- a/drivers/s390/kvm/kvm_virtio.c +++ b/drivers/s390/kvm/kvm_virtio.c @@ -441,7 +441,7 @@ static int __init kvm_devices_init(void) INIT_WORK(&hotplug_work, hotplug_devices); - ctl_set_bit(0, 9); + service_subclass_irq_register(); register_external_interrupt(0x2603, kvm_extint_handler); scan_devices(); |