[PATCH 03/18] net: caif: pass struct device to DMA API functions

[Christoph Hellwig]

The DMA API generally relies on a struct device to work properly, and
only barely works without one for legacy reasons.  Pass the easily
available struct device from the platform_device to remedy this.

Also use the proper Kconfig symbol to check for DMA API availability.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/net/caif/caif_spi.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/net/caif/caif_spi.c b/drivers/net/caif/caif_spi.c
index d28a1398c091..b7f3e263b57c 100644
--- a/drivers/net/caif/caif_spi.c
+++ b/drivers/net/caif/caif_spi.c
@@ -73,35 +73,37 @@ MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail 
alignment.");
 #define LOW_WATER_MARK   100
 #define HIGH_WATER_MARK  (LOW_WATER_MARK*5)
 
-#ifdef CONFIG_UML
+#ifdef CONFIG_HAS_DMA
 
 /*
  * We sometimes use UML for debugging, but it cannot handle
  * dma_alloc_coherent so we have to wrap it.
  */
-static inline void *dma_alloc(dma_addr_t *daddr)
+static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr)
 {
        return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL);
 }
 
-static inline void dma_free(void *cpu_addr, dma_addr_t handle)
+static inline void dma_free(struct cfspi *cfspi, void *cpu_addr,
+               dma_addr_t handle)
 {
        kfree(cpu_addr);
 }
 
 #else
 
-static inline void *dma_alloc(dma_addr_t *daddr)
+static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr)
 {
-       return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr,
+       return dma_alloc_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, daddr,
                                GFP_KERNEL);
 }
 
-static inline void dma_free(void *cpu_addr, dma_addr_t handle)
+static inline void dma_free(struct cfspi *cfspi, void *cpu_addr,
+               dma_addr_t handle)
 {
-       dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle);
+       dma_free_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, cpu_addr, handle);
 }
-#endif /* CONFIG_UML */
+#endif /* CONFIG_HAS_DMA */
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -610,13 +612,13 @@ static int cfspi_init(struct net_device *dev)
        }
 
        /* Allocate DMA buffers. */
-       cfspi->xfer.va_tx[0] = dma_alloc(&cfspi->xfer.pa_tx[0]);
+       cfspi->xfer.va_tx[0] = dma_alloc(cfspi, &cfspi->xfer.pa_tx[0]);
        if (!cfspi->xfer.va_tx[0]) {
                res = -ENODEV;
                goto err_dma_alloc_tx_0;
        }
 
-       cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx);
+       cfspi->xfer.va_rx = dma_alloc(cfspi, &cfspi->xfer.pa_rx);
 
        if (!cfspi->xfer.va_rx) {
                res = -ENODEV;
@@ -665,9 +667,9 @@ static int cfspi_init(struct net_device *dev)
        return 0;
 
  err_create_wq:
-       dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
+       dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
  err_dma_alloc_rx:
-       dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]);
+       dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]);
  err_dma_alloc_tx_0:
        return res;
 }
@@ -683,8 +685,8 @@ static void cfspi_uninit(struct net_device *dev)
 
        cfspi->ndev = NULL;
        /* Free DMA buffers. */
-       dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
-       dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]);
+       dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
+       dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]);
        set_bit(SPI_TERMINATE, &cfspi->state);
        wake_up_interruptible(&cfspi->wait);
        destroy_workqueue(cfspi->wq);
-- 
2.20.1