ide: cmd646 we can get the pci device with container_of

Patchworks-ID: 35305
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/ide/cmd646.c

@@ -68,10 +68,19 @@ static void ide_map(PCIDevice *pci_dev, int region_num,
     }
 }
 
+static PCIIDEState *pci_from_bm(BMDMAState *bm)
+{
+    if (bm->unit == 0) {
+        return container_of(bm, PCIIDEState, bmdma[0]);
+    } else {
+        return container_of(bm, PCIIDEState, bmdma[1]);
+    }
+}
+
 static uint32_t bmdma_readb(void *opaque, uint32_t addr)
 {
     BMDMAState *bm = opaque;
-    PCIIDEState *pci_dev;
+    PCIIDEState *pci_dev = pci_from_bm(bm);
     uint32_t val;
 
     switch(addr & 3) {
@@ -79,14 +88,12 @@ static uint32_t bmdma_readb(void *opaque, uint32_t addr)
         val = bm->cmd;
         break;
     case 1:
-        pci_dev = bm->pci_dev;
         val = pci_dev->dev.config[MRDMODE];
         break;
     case 2:
         val = bm->status;
         break;
     case 3:
-        pci_dev = bm->pci_dev;
         if (bm == &pci_dev->bmdma[0]) {
             val = pci_dev->dev.config[UDIDETCR0];
         } else {
@@ -106,13 +113,12 @@ static uint32_t bmdma_readb(void *opaque, uint32_t addr)
 static void bmdma_writeb(void *opaque, uint32_t addr, uint32_t val)
 {
     BMDMAState *bm = opaque;
-    PCIIDEState *pci_dev;
+    PCIIDEState *pci_dev = pci_from_bm(bm);
 #ifdef DEBUG_IDE
     printf("bmdma: writeb 0x%02x : 0x%02x\n", addr, val);
 #endif
     switch(addr & 3) {
     case 1:
-        pci_dev = bm->pci_dev;
         pci_dev->dev.config[MRDMODE] =
             (pci_dev->dev.config[MRDMODE] & ~0x30) | (val & 0x30);
         cmd646_update_irq(pci_dev);
@@ -121,7 +127,6 @@ static void bmdma_writeb(void *opaque, uint32_t addr, uint32_t val)
         bm->status = (val & 0x60) | (bm->status & 1) | (bm->status & ~val & 0x06);
         break;
     case 3:
-        pci_dev = bm->pci_dev;
         if (bm == &pci_dev->bmdma[0])
             pci_dev->dev.config[UDIDETCR0] = val;
         else