[Qemu-devel] [PATCH v3 24/46] ivshmem: shmfd can be 0

[marcandre . lureau]

From: Marc-André Lureau <address@hidden>

0 is a valid fd value, so change conditions and set -1 value early

Signed-off-by: Marc-André Lureau <address@hidden>
---
 hw/misc/ivshmem.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 14c7d58..c80503d 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -233,7 +233,7 @@ static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
 
         case IVPOSITION:
             /* return my VM ID if the memory is mapped */
-            if (s->shm_fd > 0) {
+            if (s->shm_fd >= 0) {
                 ret = s->vm_id;
             } else {
                 ret = -1;
@@ -663,6 +663,8 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error 
**errp)
         PCI_BASE_ADDRESS_MEM_PREFETCH;;
     Error *local_err = NULL;
 
+    s->shm_fd = -1;
+
     if (s->sizearg == NULL) {
         s->ivshmem_size = 4 << 20; /* 4 MB default */
     } else {
@@ -707,8 +709,6 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error 
**errp)
 
     pci_config_set_interrupt_pin(pci_conf, 1);
 
-    s->shm_fd = 0;
-
     memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s,
                           "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
 
-- 
2.4.3