ide: simplify set_inactive callbacks

Drop the unused return value and make the callback optional.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

hw/ide/ahci.c

@@ -1116,11 +1116,6 @@ static int ahci_dma_add_status(IDEDMA *dma, int status)
     return 0;
 }
 
-static int ahci_dma_set_inactive(IDEDMA *dma)
-{
-    return 0;
-}
-
 static int ahci_async_cmd_done(IDEDMA *dma)
 {
     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
@@ -1154,7 +1149,6 @@ static const IDEDMAOps ahci_dma_ops = {
     .rw_buf = ahci_dma_rw_buf,
     .set_unit = ahci_dma_set_unit,
     .add_status = ahci_dma_add_status,
-    .set_inactive = ahci_dma_set_inactive,
     .async_cmd_done = ahci_async_cmd_done,
     .restart_cb = ahci_dma_restart_cb,
 };

hw/ide/core.c

@@ -595,7 +595,9 @@ static void ide_async_cmd_done(IDEState *s)
 void ide_set_inactive(IDEState *s)
 {
     s->bus->dma->aiocb = NULL;
-    s->bus->dma->ops->set_inactive(s->bus->dma);
+    if (s->bus->dma->ops->set_inactive) {
+        s->bus->dma->ops->set_inactive(s->bus->dma);
+    }
     ide_async_cmd_done(s);
 }
 
@@ -2226,7 +2228,6 @@ static const IDEDMAOps ide_dma_nop_ops = {
     .rw_buf         = ide_nop_int,
     .set_unit       = ide_nop_int,
     .add_status     = ide_nop_int,
-    .set_inactive   = ide_nop,
     .restart_cb     = ide_nop_restart,
 };
 

hw/ide/internal.h

@@ -433,7 +433,7 @@ struct IDEDMAOps {
     DMAIntFunc *rw_buf;
     DMAIntFunc *set_unit;
     DMAIntFunc *add_status;
-    DMAFunc *set_inactive;
+    DMAVoidFunc *set_inactive;
     DMAFunc *async_cmd_done;
     DMARestartFunc *restart_cb;
     DMAVoidFunc *reset;

hw/ide/macio.c

@@ -576,7 +576,6 @@ static const IDEDMAOps dbdma_ops = {
     .rw_buf         = ide_nop_int,
     .set_unit       = ide_nop_int,
     .add_status     = ide_nop_int,
-    .set_inactive   = ide_nop,
     .restart_cb     = ide_nop_restart,
 };
 

hw/ide/pci.c

@@ -160,15 +160,13 @@ static int bmdma_add_status(IDEDMA *dma, int status)
     return 0;
 }
 
-static int bmdma_set_inactive(IDEDMA *dma)
+static void bmdma_set_inactive(IDEDMA *dma)
 {
     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 
     bm->status &= ~BM_STATUS_DMAING;
     bm->dma_cb = NULL;
     bm->unit = -1;
-
-    return 0;
 }
 
 static void bmdma_restart_dma(BMDMAState *bm, enum ide_dma_cmd dma_cmd)