Commit 12a2d5ca45 for qemu.org

commit 12a2d5ca4561e63731274382ec90e3d12f726394
Author: Honglei Huang <honghuan@amd.com>
Date:   Tue Jan 13 09:52:03 2026 +0800

    virtio-gpu: use consistent error checking for virtio_gpu_create_mapping_iov

    Unify error checking style for virtio_gpu_create_mapping_iov() across the
    codebase to improve consistency and readability.

    virtio_gpu_create_mapping_iov() returns 0 on success and negative values
    on error. The original code used inconsistent patterns for checking errors:
    - Some used 'if (ret != 0)' in virtio-gpu-virgl.c and virtio-gpu.c
    - Some used 'CHECK(!ret, cmd)' in virtio-gpu-rutabaga.c

    For if-statement checks, change to 'if (ret < 0)' which is the preferred
    QEMU coding convention for functions that return 0 on success and negative
    on error. This makes the return value convention immediately clear to code
    readers.

    For CHECK macro usage in virtio-gpu-rutabaga.c, keep the original
    'CHECK(!ret, cmd)' pattern as it is more concise and consistent with other
    error checks in the same file.

    Updated locations:
    - hw/display/virtio-gpu-virgl.c: virgl_resource_attach_backing()
    - hw/display/virtio-gpu-virgl.c: virgl_cmd_resource_create_blob()
    - hw/display/virtio-gpu.c: virtio_gpu_resource_create_blob()
    - hw/display/virtio-gpu.c: virtio_gpu_resource_attach_backing()

    Signed-off-by: Honglei Huang <honghuan@amd.com>
    Reviewed-by: Markus Armbruster <armbru@redhat.com>
    Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
    Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
    Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
    Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    Message-Id: <20260113015203.3643608-3-honghuan@amd.com>

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 741728cabb..ecf8494f36 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -561,7 +561,7 @@ static void virgl_resource_attach_backing(VirtIOGPU *g,

     ret = virtio_gpu_create_mapping_iov(g, att_rb.nr_entries, sizeof(att_rb),
                                         cmd, NULL, &res_iovs, &res_niov);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         return;
     }
@@ -705,7 +705,7 @@ static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
         ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
                                             cmd, &res->base.addrs,
                                             &res->base.iov, &res->base.iov_cnt);
-        if (ret != 0) {
+        if (ret < 0) {
             cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
             return;
         }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index f23eec6862..643e91ca2a 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -354,7 +354,7 @@ static void virtio_gpu_resource_create_blob(VirtIOGPU *g,
     ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
                                         cmd, &res->addrs, &res->iov,
                                         &res->iov_cnt);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         g_free(res);
         return;
@@ -933,7 +933,7 @@ virtio_gpu_resource_attach_backing(VirtIOGPU *g,

     ret = virtio_gpu_create_mapping_iov(g, ab.nr_entries, sizeof(ab), cmd,
                                         &res->addrs, &res->iov, &res->iov_cnt);
-    if (ret != 0) {
+    if (ret < 0) {
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         return;
     }