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[PATCH 2/2] Add a dma_device to mcb_device

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From: Michael Moese <michael.moese@men.de>

When performing DMA operations on a MCB device, the device needed
for using the DMA API is "mcb_device->bus_carrier".
This is rather lengthy, so a shortcut is introduced to struct mcb_device
in order to ensure the MCB device driver uses the correct device for DMA
operations.

Signed-off-by: Michael Moese <michael.moese@men.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/mcb/mcb-core.c | 1 +
 include/linux/mcb.h    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index 5306966..921a5d2 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -233,6 +233,7 @@ int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
 	dev->dev.bus = &mcb_bus_type;
 	dev->dev.parent = bus->dev.parent;
 	dev->dev.release = mcb_release_dev;
+	dev->dma_dev = bus->carrier;
 
 	device_id = dev->id;
 	dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
diff --git a/include/linux/mcb.h b/include/linux/mcb.h
index ee5200d..4097ac9 100644
--- a/include/linux/mcb.h
+++ b/include/linux/mcb.h
@@ -76,6 +76,7 @@ struct mcb_device {
 	int rev;
 	struct resource irq;
 	struct resource mem;
+	struct device *dma_dev;
 };
 
 static inline struct mcb_device *to_mcb_device(struct device *dev)
-- 
1.8.5.6

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[PATCH 0/2] MCB patches for v4.9 Johannes Thumshirn <jthumshirn@suse.de> - 2016-09-14 12:10 +0200
  [PATCH 1/2] Enable PCI bus mastering by default Johannes Thumshirn <jthumshirn@suse.de> - 2016-09-14 12:10 +0200
  [PATCH 2/2] Add a dma_device to mcb_device Johannes Thumshirn <jthumshirn@suse.de> - 2016-09-14 12:10 +0200

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