To improve code readability and maintainability of do_hash_operation(), this
commit introduces a new helper function: hash_write_digest_and_unmap_iov().

The helper consolidates the final digest writeback and subsequent unmapping of
the I/O vectors into a single routine.

No functional changes are introduced.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/misc/aspeed_hace.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index 22eea62693..7da781f864 100644
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -228,6 +228,26 @@ static int hash_prepare_sg_iov(AspeedHACEState *s, struct iovec *iov,
     return iov_idx;
 }
 
+static void hash_write_digest_and_unmap_iov(AspeedHACEState *s,
+                                            struct iovec *iov,
+                                            int iov_idx,
+                                            uint8_t *digest_buf,
+                                            size_t digest_len)
+{
+    if (address_space_write(&s->dram_as, s->regs[R_HASH_DEST],
+                            MEMTXATTRS_UNSPECIFIED, digest_buf, digest_len)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Failed to write digest to 0x%x\n",
+                      __func__, s->regs[R_HASH_DEST]);
+    }
+
+    for (; iov_idx > 0; iov_idx--) {
+        address_space_unmap(&s->dram_as, iov[iov_idx - 1].iov_base,
+                            iov[iov_idx - 1].iov_len, false,
+                            iov[iov_idx - 1].iov_len);
+    }
+}
+
 static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode,
                               bool acc_mode)
 {
@@ -292,18 +312,7 @@ static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode,
         return;
     }
 
-    if (address_space_write(&s->dram_as, s->regs[R_HASH_DEST],
-                            MEMTXATTRS_UNSPECIFIED,
-                            digest_buf, digest_len)) {
-        qemu_log_mask(LOG_GUEST_ERROR,
-                      "aspeed_hace: address space write failed\n");
-    }
-
-    for (; iov_idx > 0; iov_idx--) {
-        address_space_unmap(&s->dram_as, iov[iov_idx - 1].iov_base,
-                            iov[iov_idx - 1].iov_len, false,
-                            iov[iov_idx - 1].iov_len);
-    }
+    hash_write_digest_and_unmap_iov(s, iov, iov_idx, digest_buf, digest_len);
 }
 
 static uint64_t aspeed_hace_read(void *opaque, hwaddr addr, unsigned int size)
-- 
2.43.0