rapidio/tsi721: add HW specific mport removal

Add hardware-specific device removal support for Tsi721 PCIe-to-RapidIO
bridge.  To avoid excessive data type conversions, parameters passed to
some internal functions have been revised.  Dynamic memory allocations
of rio_mport and rio_ops have been replaced to reduce references between
data structures.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rapidio/devices/tsi721.h

@@ -824,7 +824,7 @@ struct tsi721_ib_win {
 
 struct tsi721_device {
 	struct pci_dev	*pdev;
-	struct rio_mport *mport;
+	struct rio_mport mport;
 	u32		flags;
 	void __iomem	*regs;
 #ifdef CONFIG_PCI_MSI
@@ -866,9 +866,11 @@ struct tsi721_device {
 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 extern void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan);
 extern int tsi721_register_dma(struct tsi721_device *priv);
+extern void tsi721_unregister_dma(struct tsi721_device *priv);
 extern void tsi721_dma_stop_all(struct tsi721_device *priv);
 #else
 #define tsi721_dma_stop_all(priv) do {} while (0)
+#define tsi721_unregister_dma(priv) do {} while (0)
 #endif
 
 #endif

drivers/rapidio/devices/tsi721_dma.c

@@ -887,7 +887,7 @@ int tsi721_register_dma(struct tsi721_device *priv)
 	int i;
 	int nr_channels = 0;
 	int err;
-	struct rio_mport *mport = priv->mport;
+	struct rio_mport *mport = &priv->mport;
 
 	INIT_LIST_HEAD(&mport->dma.channels);
 
@@ -937,3 +937,29 @@ int tsi721_register_dma(struct tsi721_device *priv)
 
 	return err;
 }
+
+void tsi721_unregister_dma(struct tsi721_device *priv)
+{
+	struct rio_mport *mport = &priv->mport;
+	struct dma_chan *chan, *_c;
+	struct tsi721_bdma_chan *bdma_chan;
+
+	tsi721_dma_stop_all(priv);
+	dma_async_device_unregister(&mport->dma);
+
+	list_for_each_entry_safe(chan, _c, &mport->dma.channels,
+					device_node) {
+		bdma_chan = to_tsi721_chan(chan);
+		if (bdma_chan->active) {
+			tsi721_bdma_interrupt_enable(bdma_chan, 0);
+			bdma_chan->active = false;
+			tsi721_sync_dma_irq(bdma_chan);
+			tasklet_kill(&bdma_chan->tasklet);
+			INIT_LIST_HEAD(&bdma_chan->free_list);
+			kfree(bdma_chan->tx_desc);
+			tsi721_bdma_ch_free(bdma_chan);
+		}
+
+		list_del(&chan->device_node);
+	}
+}