ide: PCI BMDMA initialization fixes (take 2)

* Set hwif->dma_base only if allocation of extra ports succeeds.

While at it:

* Move setting of hwif->dma_{base,master} from ide_{mapped_mmio,iomio}_dma()
  to ide_setup_dma().

* Rename 'dma_base' argument to 'base' in ide_setup_dma() (to make the code
  obey 80-columns limit and increase its readability).

* Remove stale ide_setup_dma() comment.

v2:
* Change to allocate hwif->dmatable_cpu before reserving I/O ports missed
  teardown code (spotted by Sergei).  On the second thought this change is
  actually unnecessary so revert it in v2.

* Make ide_release_dma_engine() void and remove needless comment.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 10 insertions, 22 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 80b4f17f3941..428f7a8a00b6 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -901,10 +901,7 @@ void ide_dma_timeout (ide_drive_t *drive)
 
 EXPORT_SYMBOL(ide_dma_timeout);
 
-/*
- * Needed for allowing full modular support of ide-driver
- */
-static int ide_release_dma_engine(ide_hwif_t *hwif)
+static void ide_release_dma_engine(ide_hwif_t *hwif)
 {
         if (hwif->dmatable_cpu) {
                 pci_free_consistent(hwif->pci_dev,
@@ -913,7 +910,6 @@ static int ide_release_dma_engine(ide_hwif_t *hwif)
                                     hwif->dmatable_dma);
                 hwif->dmatable_cpu = NULL;
         }
-        return 1;
 }
 
 static int ide_release_iomio_dma(ide_hwif_t *hwif)
@@ -956,12 +952,6 @@ static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned in
 {
         printk(KERN_INFO "    %s: MMIO-DMA ", hwif->name);
 
-        hwif->dma_base = base;
-
-        if(hwif->mate)
-                hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
-        else
-                hwif->dma_master = base;
         return 0;
 }
 
@@ -975,8 +965,6 @@ static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int port
                 return 1;
         }
 
-        hwif->dma_base = base;
-
         if (hwif->cds->extra) {
                 hwif->extra_base = base + (hwif->channel ? 8 : 16);
 
@@ -991,10 +979,6 @@ static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int port
                 }
         }
 
-        if(hwif->mate)
-                hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
-        else
-                hwif->dma_master = base;
         return 0;
 }
 
@@ -1006,12 +990,9 @@ static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int por
         return ide_iomio_dma(hwif, base, ports);
 }
 
-/*
- * This can be called for a dynamically installed interface. Don't __init it
- */
-void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
+void ide_setup_dma(ide_hwif_t *hwif, unsigned long base, unsigned num_ports)
 {
-        if (ide_dma_iobase(hwif, dma_base, num_ports))
+        if (ide_dma_iobase(hwif, base, num_ports))
                 return;
 
         if (ide_allocate_dma_engine(hwif)) {
@@ -1019,6 +1000,13 @@ void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_p
                 return;
         }
 
+        hwif->dma_base = base;
+
+        if (hwif->mate)
+                hwif->dma_master = hwif->channel ? hwif->mate->dma_base : base;
+        else
+                hwif->dma_master = base;
+
         if (!(hwif->dma_command))
                 hwif->dma_command       = hwif->dma_base;
         if (!(hwif->dma_vendor1))