mac_dbdma: Remove leftover dma_memory_unmap calls

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 <[email protected]>
Message-Id: <[email protected]>
Fixes: be1e343 ("macio: switch over to new byte-aligned DMA helpers")
Reviewed-by: Mark Cave-Ayland <[email protected]>
Tested-by: Mark Cave-Ayland <[email protected]>
Signed-off-by: Mark Cave-Ayland <[email protected]>
(cherry picked from commit 2d0a071)
Signed-off-by: Michael Tokarev <[email protected]>

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);

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;
 };
 
 /*