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memory: don't try to adjust endianness for zero length eventfd

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There's no need to adjust endianness for zero length eventfd since the
data wrote was actually ignored by kernel. So skip the adjust in this
case to fix a possible crash when trying to use wildcard mmio eventfd
in ppc.

Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2015-11-06 16:02:45 +08:00 • committed by Michael S. Tsirkin
parent a6df8adf3e
commit b8aecea23a
1 changed files with 6 additions and 2 deletions
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8
memory.c
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@ -1688,7 +1688,9 @@ void memory_region_add_eventfd(MemoryRegion *mr,
};
unsigned i;
adjust_endianness(mr, &mrfd.data, size);
if (size) {
adjust_endianness(mr, &mrfd.data, size);
}
memory_region_transaction_begin();
for (i = 0; i < mr->ioeventfd_nb; ++i) {
if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) {
@ -1721,7 +1723,9 @@ void memory_region_del_eventfd(MemoryRegion *mr,
};
unsigned i;
adjust_endianness(mr, &mrfd.data, size);
if (size) {
adjust_endianness(mr, &mrfd.data, size);
}
memory_region_transaction_begin();
for (i = 0; i < mr->ioeventfd_nb; ++i) {
if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) {