[PATCH 11/12] hw/nvme: simplify copy command error handling

[Klaus Jensen <its@irrelevant.dk>]

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

Move error handling down in the call stack to simplify the control flow.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ctrl.c | 50 ++++++++++++--------------------------------------
 1 file changed, 12 insertions(+), 38 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 5eee730ed0cf..4d6b4c9f00ba 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -2614,7 +2614,7 @@ static void nvme_copy_bh(void *opaque)
     qemu_aio_unref(iocb);
 }
 
-static void nvme_copy_cb(void *opaque, int ret);
+static void nvme_do_copy(NvmeCopyAIOCB *iocb);
 
 static void nvme_copy_source_range_parse_format0(void *ranges, int idx,
                                                  uint64_t *slba, uint32_t *nlb,
@@ -2726,7 +2726,7 @@ static void nvme_copy_out_completed_cb(void *opaque, int ret)
     iocb->idx++;
     iocb->slba += nlb;
 out:
-    nvme_copy_cb(iocb, iocb->ret);
+    nvme_do_copy(iocb);
 }
 
 static void nvme_copy_out_cb(void *opaque, int ret)
@@ -2738,16 +2738,8 @@ static void nvme_copy_out_cb(void *opaque, int ret)
     size_t mlen;
     uint8_t *mbounce;
 
-    if (ret < 0) {
-        iocb->ret = ret;
+    if (ret < 0 || iocb->ret < 0 || !ns->lbaf.ms) {
         goto out;
-    } else if (iocb->ret < 0) {
-        goto out;
-    }
-
-    if (!ns->lbaf.ms) {
-        nvme_copy_out_completed_cb(iocb, 0);
-        return;
     }
 
     nvme_copy_source_range_parse(iocb->ranges, iocb->idx, iocb->format, NULL,
@@ -2766,7 +2758,7 @@ static void nvme_copy_out_cb(void *opaque, int ret)
     return;
 
 out:
-    nvme_copy_cb(iocb, ret);
+    nvme_copy_out_completed_cb(iocb, ret);
 }
 
 static void nvme_copy_in_completed_cb(void *opaque, int ret)
@@ -2860,15 +2852,9 @@ static void nvme_copy_in_completed_cb(void *opaque, int ret)
 
 invalid:
     req->status = status;
-    iocb->aiocb = NULL;
-    if (iocb->bh) {
-        qemu_bh_schedule(iocb->bh);
-    }
-
-    return;
-
+    iocb->ret = -1;
 out:
-    nvme_copy_cb(iocb, ret);
+    nvme_do_copy(iocb);
 }
 
 static void nvme_copy_in_cb(void *opaque, int ret)
@@ -2879,16 +2865,8 @@ static void nvme_copy_in_cb(void *opaque, int ret)
     uint64_t slba;
     uint32_t nlb;
 
-    if (ret < 0) {
-        iocb->ret = ret;
+    if (ret < 0 || iocb->ret < 0 || !ns->lbaf.ms) {
         goto out;
-    } else if (iocb->ret < 0) {
-        goto out;
-    }
-
-    if (!ns->lbaf.ms) {
-        nvme_copy_in_completed_cb(iocb, 0);
-        return;
     }
 
     nvme_copy_source_range_parse(iocb->ranges, iocb->idx, iocb->format, &slba,
@@ -2904,12 +2882,11 @@ static void nvme_copy_in_cb(void *opaque, int ret)
     return;
 
 out:
-    nvme_copy_cb(iocb, iocb->ret);
+    nvme_copy_in_completed_cb(iocb, ret);
 }
 
-static void nvme_copy_cb(void *opaque, int ret)
+static void nvme_do_copy(NvmeCopyAIOCB *iocb)
 {
-    NvmeCopyAIOCB *iocb = opaque;
     NvmeRequest *req = iocb->req;
     NvmeNamespace *ns = req->ns;
     uint64_t slba;
@@ -2917,10 +2894,7 @@ static void nvme_copy_cb(void *opaque, int ret)
     size_t len;
     uint16_t status;
 
-    if (ret < 0) {
-        iocb->ret = ret;
-        goto done;
-    } else if (iocb->ret < 0) {
+    if (iocb->ret < 0) {
         goto done;
     }
 
@@ -2967,6 +2941,7 @@ static void nvme_copy_cb(void *opaque, int ret)
 
 invalid:
     req->status = status;
+    iocb->ret = -1;
 done:
     iocb->aiocb = NULL;
     if (iocb->bh) {
@@ -2974,7 +2949,6 @@ done:
     }
 }
 
-
 static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req)
 {
     NvmeNamespace *ns = req->ns;
@@ -3060,7 +3034,7 @@ static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req)
                      BLOCK_ACCT_WRITE);
 
     req->aiocb = &iocb->common;
-    nvme_copy_cb(iocb, 0);
+    nvme_do_copy(iocb);
 
     return NVME_NO_COMPLETE;
 
-- 
2.36.1