ide: simplify start_transfer callbacks

Drop the unused return value and make the callback optional.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

5 files changed, 5 insertions, 24 deletions

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index e494503330..adbac3d52f 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -991,7 +991,7 @@ out:
 }
 
 /* DMA dev <-> ram */
-static int ahci_start_transfer(IDEDMA *dma)
+static void ahci_start_transfer(IDEDMA *dma)
 {
     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
     IDEState *s = &ad->port.ifs[0];
@@ -1041,8 +1041,6 @@ out:
         /* done with DMA */
         ahci_trigger_irq(ad->hba, ad, PORT_IRQ_STAT_DSS);
     }
-
-    return 0;
 }
 
 static void ahci_start_dma(IDEDMA *dma, IDEState *s,
diff --git a/hw/ide/core.c b/hw/ide/core.c
index d52a6f6104..e5ddecb811 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -434,7 +434,9 @@ void ide_transfer_start(IDEState *s, uint8_t *buf, int size,
     if (!(s->status & ERR_STAT)) {
         s->status |= DRQ_STAT;
     }
-    s->bus->dma->ops->start_transfer(s->bus->dma);
+    if (s->bus->dma->ops->start_transfer) {
+        s->bus->dma->ops->start_transfer(s->bus->dma);
+    }
 }
 
 void ide_transfer_stop(IDEState *s)
@@ -2207,11 +2209,6 @@ static void ide_nop_start(IDEDMA *dma, IDEState *s,
 {
 }
 
-static int ide_nop(IDEDMA *dma)
-{
-    return 0;
-}
-
 static int ide_nop_int(IDEDMA *dma, int x)
 {
     return 0;
@@ -2223,7 +2220,6 @@ static void ide_nop_restart(void *opaque, int x, RunState y)
 
 static const IDEDMAOps ide_dma_nop_ops = {
     .start_dma      = ide_nop_start,
-    .start_transfer = ide_nop,
     .prepare_buf    = ide_nop_int,
     .rw_buf         = ide_nop_int,
     .set_unit       = ide_nop_int,
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index 940dd4510c..64fbf2fb62 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -321,7 +321,6 @@ typedef void EndTransferFunc(IDEState *);
 
 typedef void DMAStartFunc(IDEDMA *, IDEState *, BlockDriverCompletionFunc *);
 typedef void DMAVoidFunc(IDEDMA *);
-typedef int DMAFunc(IDEDMA *);
 typedef int DMAIntFunc(IDEDMA *, int);
 typedef void DMARestartFunc(void *, int, RunState);
 
@@ -428,7 +427,7 @@ struct IDEState {
 
 struct IDEDMAOps {
     DMAStartFunc *start_dma;
-    DMAFunc *start_transfer;
+    DMAVoidFunc *start_transfer;
     DMAIntFunc *prepare_buf;
     DMAIntFunc *rw_buf;
     DMAIntFunc *set_unit;
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index 0e26bac67f..b7cedb65a5 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -545,11 +545,6 @@ static void macio_ide_reset(DeviceState *dev)
     ide_bus_reset(&d->bus);
 }
 
-static int ide_nop(IDEDMA *dma)
-{
-    return 0;
-}
-
 static int ide_nop_int(IDEDMA *dma, int x)
 {
     return 0;
@@ -571,7 +566,6 @@ static void ide_dbdma_start(IDEDMA *dma, IDEState *s,
 
 static const IDEDMAOps dbdma_ops = {
     .start_dma      = ide_dbdma_start,
-    .start_transfer = ide_nop,
     .prepare_buf    = ide_nop_int,
     .rw_buf         = ide_nop_int,
     .set_unit       = ide_nop_int,
diff --git a/hw/ide/pci.c b/hw/ide/pci.c
index 9dc3cc5611..1ee8c0a4d5 100644
--- a/hw/ide/pci.c
+++ b/hw/ide/pci.c
@@ -264,11 +264,6 @@ static void bmdma_reset(IDEDMA *dma)
     bm->nsector = 0;
 }
 
-static int bmdma_start_transfer(IDEDMA *dma)
-{
-    return 0;
-}
-
 static void bmdma_irq(void *opaque, int n, int level)
 {
     BMDMAState *bm = opaque;
@@ -500,7 +495,6 @@ void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
 
 static const struct IDEDMAOps bmdma_ops = {
     .start_dma = bmdma_start_dma,
-    .start_transfer = bmdma_start_transfer,
     .prepare_buf = bmdma_prepare_buf,
     .rw_buf = bmdma_rw_buf,
     .set_unit = bmdma_set_unit,