We are going to modify the code in the next commit. Renaming
the 'resp' variable to 'id' first makes the next commit easier
to review. No logical changes.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/block/nvme.c b/block/nvme.c
index 28762d7ee8..b9760ff04f 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -510,8 +510,8 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
     BDRVNVMeState *s = bs->opaque;
     NvmeIdCtrl *idctrl;
     NvmeIdNs *idns;
+    uint8_t *id;
     NvmeLBAF *lbaf;
-    uint8_t *resp;
     uint16_t oncs;
     int r;
     uint64_t iova;
@@ -520,14 +520,14 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
         .cdw10 = cpu_to_le32(0x1),
     };
 
-    resp = qemu_try_blockalign0(bs, sizeof(NvmeIdCtrl));
-    if (!resp) {
+    id = qemu_try_blockalign0(bs, sizeof(NvmeIdCtrl));
+    if (!id) {
         error_setg(errp, "Cannot allocate buffer for identify response");
         goto out;
     }
-    idctrl = (NvmeIdCtrl *)resp;
-    idns = (NvmeIdNs *)resp;
-    r = qemu_vfio_dma_map(s->vfio, resp, sizeof(NvmeIdCtrl), true, &iova);
+    idctrl = (NvmeIdCtrl *)id;
+    idns = (NvmeIdNs *)id;
+    r = qemu_vfio_dma_map(s->vfio, id, sizeof(NvmeIdCtrl), true, &iova);
     if (r) {
         error_setg(errp, "Cannot map buffer for DMA");
         goto out;
@@ -554,8 +554,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
     s->supports_write_zeroes = !!(oncs & NVME_ONCS_WRITE_ZEROS);
     s->supports_discard = !!(oncs & NVME_ONCS_DSM);
 
-    memset(resp, 0, 4096);
-
+    memset(id, 0, 4096);
     cmd.cdw10 = 0;
     cmd.nsid = cpu_to_le32(namespace);
     if (nvme_cmd_sync(bs, s->queues[QUEUE_INDEX_ADMIN], &cmd)) {
@@ -587,8 +586,8 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
 
     s->blkshift = lbaf->ds;
 out:
-    qemu_vfio_dma_unmap(s->vfio, resp);
-    qemu_vfree(resp);
+    qemu_vfio_dma_unmap(s->vfio, id);
+    qemu_vfree(id);
 }
 
 static bool nvme_poll_queues(BDRVNVMeState *s)
-- 
2.21.3

On Tue, Jun 30, 2020 at 09:13:11PM +0200, Philippe Mathieu-Daudé wrote:
> We are going to modify the code in the next commit. Renaming
> the 'resp' variable to 'id' first makes the next commit easier
> to review. No logical changes.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  block/nvme.c | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>