ssb: Fix usage of struct device used for DMAing

This fixes DMA on architectures where DMA is nontrivial, like PPC64.
We must use the host-device's (PCI) struct device for any DMA
operation instead of the SSB device. For this we add a new
struct device pointer to the SSB device structure that will always
point to the right device for DMAing.

Without this patch b43 and b44 drivers won't work on complex-DMA
architectures, that for example need dev->archdata for DMA operations.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/ssb/ssb.h b/include/linux/ssb/ssb.h
index 20add65215af..db53defde5ee 100644
--- a/include/linux/ssb/ssb.h
+++ b/include/linux/ssb/ssb.h
@@ -129,6 +129,10 @@ struct ssb_device {
         const struct ssb_bus_ops *ops;
 
         struct device *dev;
+        /* Pointer to the device that has to be used for
+         * any DMA related operation. */
+        struct device *dma_dev;
+
         struct ssb_bus *bus;
         struct ssb_device_id id;