[v9,6/8] bcm2835_property: disable reentrancy detection for iomem

Commit Message

Alexander Bulekov April 26, 2023, 4:19 p.m. UTC

As the code is designed for re-entrant calls from bcm2835_property to
bcm2835_mbox and back into bcm2835_property, mark iomem as
reentrancy-safe.

Signed-off-by: Alexander Bulekov <[e-mail]>
Reviewed-by: Thomas Huth <[e-mail]>
---
 hw/misc/bcm2835_property.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c
index 890ae7bae5..de056ea2df 100644
--- a/hw/misc/bcm2835_property.c
+++ b/hw/misc/bcm2835_property.c
@@ -382,6 +382,13 @@  static void bcm2835_property_init(Object *obj)
 
     memory_region_init_io(&s->iomem, OBJECT(s), &bcm2835_property_ops, s,
                           TYPE_BCM2835_PROPERTY, 0x10);
+
+    /*
+     * bcm2835_property_ops call into bcm2835_mbox, which in-turn reads from
+     * iomem. As such, mark iomem as re-entracy safe.
+     */
+    s->iomem.disable_reentrancy_guard = true;
+
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
     sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
 }