From: Mattias Nissler <mnissler@rivosinc.com>

These were passing a NULL buffer pointer unconditionally, which happens
to behave in a mostly benign way (except for the chance of an excess
memory region unref and a bounce buffer leak). Per the function comment,
this was never meant to be accepted though, and triggers an assertion
with the "softmmu: Support concurrent bounce buffers" change.

Given that the code in question never sets up any mappings, just remove
the unnecessary dma_memory_unmap calls along with the DBDMA_io struct
fields that are now entirely unused.

Signed-off-by: Mattias Nissler <mnissler@rivosinc.com>
Message-Id: <20240916175708.1829059-1-mnissler@rivosinc.com>
Fixes: be1e343995 ("macio: switch over to new byte-aligned DMA helpers")
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
(cherry picked from commit 2d0a071e625d7234e8c5623b7e7bf445e1bef72c)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index e84bf2c9f6..15dd40138e 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -119,9 +119,6 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
     return;
 
 done:
-    dma_memory_unmap(&address_space_memory, io->dma_mem, io->dma_len,
-                     io->dir, io->dma_len);
-
     if (ret < 0) {
         block_acct_failed(blk_get_stats(s->blk), &s->acct);
     } else {
@@ -202,9 +199,6 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
     return;
 
 done:
-    dma_memory_unmap(&address_space_memory, io->dma_mem, io->dma_len,
-                     io->dir, io->dma_len);
-
     if (s->dma_cmd == IDE_DMA_READ || s->dma_cmd == IDE_DMA_WRITE) {
         if (ret < 0) {
             block_acct_failed(blk_get_stats(s->blk), &s->acct);
diff --git a/include/hw/ppc/mac_dbdma.h b/include/hw/ppc/mac_dbdma.h
index 4a3f644516..c774f6bf84 100644
--- a/include/hw/ppc/mac_dbdma.h
+++ b/include/hw/ppc/mac_dbdma.h
@@ -44,10 +44,6 @@ struct DBDMA_io {
     DBDMA_end dma_end;
     /* DMA is in progress, don't start another one */
     bool processing;
-    /* DMA request */
-    void *dma_mem;
-    dma_addr_t dma_len;
-    DMADirection dir;
 };
 
 /*
-- 
2.39.5