[Qemu-devel] [PATCH v7 10/10] msi_init: convert assert to return -errno

[Cao jin]

According to the disscussion:
http://lists.nongnu.org/archive/html/qemu-devel/2016-09/msg08215.html

Let leaf function returns reasonable -errno, let caller decide how to
handle the return value.

Suggested-by: Markus Armbruster <address@hidden>
CC: Markus Armbruster <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Marcel Apfelbaum <address@hidden>

Reviewed-by: Markus Armbruster <address@hidden>
Reviewed-by: Marcel Apfelbaum <address@hidden>
Signed-off-by: Cao jin <address@hidden>
---
 hw/pci/msi.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/pci/msi.c b/hw/pci/msi.c
index a87b227..af3efbe 100644
--- a/hw/pci/msi.c
+++ b/hw/pci/msi.c
@@ -201,9 +201,12 @@ int msi_init(struct PCIDevice *dev, uint8_t offset,
                    " 64bit %d mask %d\n",
                    offset, nr_vectors, msi64bit, msi_per_vector_mask);
 
-    assert(!(nr_vectors & (nr_vectors - 1)));   /* power of 2 */
-    assert(nr_vectors > 0);
-    assert(nr_vectors <= PCI_MSI_VECTORS_MAX);
+    /* vector sanity test: should in range 1 - 32, should be power of 2 */
+    if (!is_power_of_2(nr_vectors) || nr_vectors > PCI_MSI_VECTORS_MAX) {
+        error_setg(errp, "Invalid vector number: %d", nr_vectors);
+        return -EINVAL;
+    }
+
     /* the nr of MSI vectors is up to 32 */
     vectors_order = ctz32(nr_vectors);
 
-- 
2.1.0