[PATCH v3 06/16] nvme: refactor nvme_addr_read

[Klaus Jensen <its@irrelevant.dk>]

From: Klaus Jensen <k.jensen@samsung.com>

Pull the controller memory buffer check to its own function. The check
will be used on its own in later patches.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsky@redhat.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
---
 hw/block/nvme.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 4aa45f511118..5605875e2614 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -66,14 +66,22 @@
 
 static void nvme_process_sq(void *opaque);
 
+static bool nvme_addr_is_cmb(NvmeCtrl *n, hwaddr addr)
+{
+    hwaddr low = n->ctrl_mem.addr;
+    hwaddr hi  = n->ctrl_mem.addr + int128_get64(n->ctrl_mem.size);
+
+    return addr >= low && addr < hi;
+}
+
 static void nvme_addr_read(NvmeCtrl *n, hwaddr addr, void *buf, int size)
 {
-    if (n->cmbsz && addr >= n->ctrl_mem.addr &&
-                addr < (n->ctrl_mem.addr + int128_get64(n->ctrl_mem.size))) {
+    if (n->cmbsz && nvme_addr_is_cmb(n, addr)) {
         memcpy(buf, (void *)&n->cmbuf[addr - n->ctrl_mem.addr], size);
-    } else {
-        pci_dma_read(&n->parent_obj, addr, buf, size);
+        return;
     }
+
+    pci_dma_read(&n->parent_obj, addr, buf, size);
 }
 
 static int nvme_check_sqid(NvmeCtrl *n, uint16_t sqid)
-- 
2.26.2