[Qemu-devel] [PATCH 1/6] msi: Guard msi/msix_write_config with msi_present

[Jan Kiszka]

From: Jan Kiszka <jan.kis...@siemens.com>

Terminate msi/msix_write_config early if support is not enabled. This
allows to remove checks at the caller site if MSI is optional.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
 hw/msi.c  |    3 ++-
 hw/msix.c |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/msi.c b/hw/msi.c
index f214fcf..541e4e1 100644
--- a/hw/msi.c
+++ b/hw/msi.c
@@ -264,7 +264,8 @@ void msi_write_config(PCIDevice *dev, uint32_t addr, 
uint32_t val, int len)
     unsigned int vector;
     uint32_t pending;
 
-    if (!ranges_overlap(addr, len, dev->msi_cap, msi_cap_sizeof(flags))) {
+    if (!msi_present(dev) ||
+        !ranges_overlap(addr, len, dev->msi_cap, msi_cap_sizeof(flags))) {
         return;
     }
 
diff --git a/hw/msix.c b/hw/msix.c
index 149eed2..32fd9b2 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -156,7 +156,7 @@ void msix_write_config(PCIDevice *dev, uint32_t addr,
     int vector;
     bool was_masked;
 
-    if (!range_covers_byte(addr, len, enable_pos)) {
+    if (!msix_present(dev) || !range_covers_byte(addr, len, enable_pos)) {
         return;
     }
 
-- 
1.7.3.4