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virtio-ccw: clean up notify 

Coverity recently started complaining about virtio_ccw_notify().  Turns
out, there is a couple of things that can be cleaned up.  Let's clean!

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Fixes: CID 1390619
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <20180516132757.68558-1-pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Halil Pasic 2018-05-16 15:27:57 +02:00 committed by Cornelia Huck
parent 2ef2f16781
commit 7a5342e7cc
1 changed files with 9 additions and 4 deletions
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13
hw/s390x/virtio-ccw.c
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@ -1001,10 +1001,15 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
SubchDev *sch = ccw_dev->sch;
uint64_t indicators;
/* queue indicators + secondary indicators */
if (vector >= VIRTIO_QUEUE_MAX + 64) {
if (vector == VIRTIO_NO_VECTOR) {
return;
}
/*
* vector < VIRTIO_QUEUE_MAX: notification for a virtqueue
* vector == VIRTIO_QUEUE_MAX: configuration change notification
* bits beyond that are unused and should never be notified for
*/
assert(vector <= VIRTIO_QUEUE_MAX);
if (vector < VIRTIO_QUEUE_MAX) {
if (!dev->indicators) {
@ -1027,6 +1032,7 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc);
}
} else {
assert(vector < NR_CLASSIC_INDICATOR_BITS);
indicators = address_space_ldq(&address_space_memory,
dev->indicators->addr,
MEMTXATTRS_UNSPECIFIED,
@ -1040,12 +1046,11 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
if (!dev->indicators2) {
return;
}
vector = 0;
indicators = address_space_ldq(&address_space_memory,
dev->indicators2->addr,
MEMTXATTRS_UNSPECIFIED,
NULL);
indicators |= 1ULL << vector;
indicators |= 1ULL;
address_space_stq(&address_space_memory, dev->indicators2->addr,
indicators, MEMTXATTRS_UNSPECIFIED, NULL);
css_conditional_io_interrupt(sch);