arm: use a dummy struct device for ISA DMA use of the DMA API

This gets rid of the last NULL dev argument passed to the DMA API.

Signed-off-by: Christoph Hellwig <hch@lst.de>

2 files changed, 14 insertions, 2 deletions

diff --git a/arch/arm/kernel/dma-isa.c b/arch/arm/kernel/dma-isa.c
index 84363fe7bad2..10c45cc6b957 100644
--- a/arch/arm/kernel/dma-isa.c
+++ b/arch/arm/kernel/dma-isa.c
@@ -55,6 +55,12 @@ static int isa_get_dma_residue(unsigned int chan, dma_t *dma)
         return chan < 4 ? count : (count << 1);
 }
 
+static struct device isa_dma_dev = {
+        .init_name              = "fallback device",
+        .coherent_dma_mask      = ~(dma_addr_t)0,
+        .dma_mask               = &isa_dma_dev.coherent_dma_mask,
+};
+
 static void isa_enable_dma(unsigned int chan, dma_t *dma)
 {
         if (dma->invalid) {
@@ -89,7 +95,7 @@ static void isa_enable_dma(unsigned int chan, dma_t *dma)
                         dma->sg = &dma->buf;
                         dma->sgcount = 1;
                         dma->buf.length = dma->count;
-                        dma->buf.dma_address = dma_map_single(NULL,
+                        dma->buf.dma_address = dma_map_single(&isa_dma_dev,
                                 dma->addr, dma->count,
                                 direction);
                 }
diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c
index fb48f3141fb4..f2703ca17954 100644
--- a/arch/arm/mach-rpc/dma.c
+++ b/arch/arm/mach-rpc/dma.c
@@ -151,6 +151,12 @@ static void iomd_free_dma(unsigned int chan, dma_t *dma)
         free_irq(idma->irq, idma);
 }
 
+static struct device isa_dma_dev = {
+        .init_name              = "fallback device",
+        .coherent_dma_mask      = ~(dma_addr_t)0,
+        .dma_mask               = &isa_dma_dev.coherent_dma_mask,
+};
+
 static void iomd_enable_dma(unsigned int chan, dma_t *dma)
 {
         struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
@@ -168,7 +174,7 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma)
                         idma->dma.sg = &idma->dma.buf;
                         idma->dma.sgcount = 1;
                         idma->dma.buf.length = idma->dma.count;
-                        idma->dma.buf.dma_address = dma_map_single(NULL,
+                        idma->dma.buf.dma_address = dma_map_single(&isa_dma_dev,
                                 idma->dma.addr, idma->dma.count,
                                 idma->dma.dma_mode == DMA_MODE_READ ?
                                 DMA_FROM_DEVICE : DMA_TO_DEVICE);