block/nvme: Automatically free qemu_memalign() with QEMU_AUTO_VFREE

Since commit 4d324c0bf65 ("introduce QEMU_AUTO_VFREE") buffers
allocated by qemu_memalign() can automatically freed when using
the QEMU_AUTO_VFREE macro. Use it to simplify a bit.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211006164931.172349-2-philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/block/nvme.c b/block/nvme.c
index 1cc7b62..fefcc04 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -514,10 +514,10 @@ static bool nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
 {
     BDRVNVMeState *s = bs->opaque;
     bool ret = false;
-    union {
+    QEMU_AUTO_VFREE union {
         NvmeIdCtrl ctrl;
         NvmeIdNs ns;
-    } *id;
+    } *id = NULL;
     NvmeLBAF *lbaf;
     uint16_t oncs;
     int r;
@@ -595,7 +595,6 @@ static bool nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
     s->blkshift = lbaf->ds;
 out:
     qemu_vfio_dma_unmap(s->vfio, id);
-    qemu_vfree(id);
 
     return ret;
 }
@@ -1219,7 +1218,7 @@ static int nvme_co_prw(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 {
     BDRVNVMeState *s = bs->opaque;
     int r;
-    uint8_t *buf = NULL;
+    QEMU_AUTO_VFREE uint8_t *buf = NULL;
     QEMUIOVector local_qiov;
     size_t len = QEMU_ALIGN_UP(bytes, qemu_real_host_page_size);
     assert(QEMU_IS_ALIGNED(offset, s->page_size));
@@ -1246,7 +1245,6 @@ static int nvme_co_prw(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
     if (!r && !is_write) {
         qemu_iovec_from_buf(qiov, 0, buf, bytes);
     }
-    qemu_vfree(buf);
     return r;
 }
 
@@ -1365,7 +1363,7 @@ static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs,
     BDRVNVMeState *s = bs->opaque;
     NVMeQueuePair *ioq = s->queues[INDEX_IO(0)];
     NVMeRequest *req;
-    NvmeDsmRange *buf;
+    QEMU_AUTO_VFREE NvmeDsmRange *buf = NULL;
     QEMUIOVector local_qiov;
     int ret;
 
@@ -1440,7 +1438,6 @@ static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs,
     trace_nvme_dsm_done(s, offset, bytes, ret);
 out:
     qemu_iovec_destroy(&local_qiov);
-    qemu_vfree(buf);
     return ret;
 
 }