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spi: core: Protect DMA code by #ifdef CONFIG_HAS_DMA 

If NO_DMA=y:

drivers/built-in.o: In function `spi_map_buf':
spi.c:(.text+0x21bc60): undefined reference to `dma_map_sg'
drivers/built-in.o: In function `spi_unmap_buf.isra.33':
spi.c:(.text+0x21c32e): undefined reference to `dma_unmap_sg'
make[3]: *** [vmlinux] Error 1

Protect the DMA code by #ifdef CONFIG_HAS_DMA to fix this:
  - Extract __spi_map_msg() from spi_map_msg(),
  - Provide dummy definitions of __spi_map_msg() and spi_unmap_msg() if
    !CONFIG_HAS_DMA.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-05-02 06:29:34 +02:00 committed by Mark Brown
parent 83596fbeb5
commit 2de440f59c
1 changed files with 65 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

109
drivers/spi/spi.c
View File

@ -580,6 +580,7 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
spi->master->set_cs(spi, !enable);
}
#ifdef CONFIG_HAS_DMA
static int spi_map_buf(struct spi_master *master, struct device *dev,
struct sg_table *sgt, void *buf, size_t len,
enum dma_data_direction dir)
@ -637,55 +638,12 @@ static void spi_unmap_buf(struct spi_master *master, struct device *dev,
}
}
static int spi_map_msg(struct spi_master *master, struct spi_message *msg)
static int __spi_map_msg(struct spi_master *master, struct spi_message *msg)
{
struct device *tx_dev, *rx_dev;
struct spi_transfer *xfer;
void *tmp;
unsigned int max_tx, max_rx;
int ret;
if (master->flags & (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX)) {
max_tx = 0;
max_rx = 0;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if ((master->flags & SPI_MASTER_MUST_TX) &&
!xfer->tx_buf)
max_tx = max(xfer->len, max_tx);
if ((master->flags & SPI_MASTER_MUST_RX) &&
!xfer->rx_buf)
max_rx = max(xfer->len, max_rx);
}
if (max_tx) {
tmp = krealloc(master->dummy_tx, max_tx,
GFP_KERNEL | GFP_DMA);
if (!tmp)
return -ENOMEM;
master->dummy_tx = tmp;
memset(tmp, 0, max_tx);
}
if (max_rx) {
tmp = krealloc(master->dummy_rx, max_rx,
GFP_KERNEL | GFP_DMA);
if (!tmp)
return -ENOMEM;
master->dummy_rx = tmp;
}
if (max_tx || max_rx) {
list_for_each_entry(xfer, &msg->transfers,
transfer_list) {
if (!xfer->tx_buf)
xfer->tx_buf = master->dummy_tx;
if (!xfer->rx_buf)
xfer->rx_buf = master->dummy_rx;
}
}
}
if (!master->can_dma)
return 0;
@ -742,6 +700,69 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
return 0;
}
#else /* !CONFIG_HAS_DMA */
static inline int __spi_map_msg(struct spi_master *master,
struct spi_message *msg)
{
return 0;
}
static inline int spi_unmap_msg(struct spi_master *master,
struct spi_message *msg)
{
return 0;
}
#endif /* !CONFIG_HAS_DMA */
static int spi_map_msg(struct spi_master *master, struct spi_message *msg)
{
struct spi_transfer *xfer;
void *tmp;
unsigned int max_tx, max_rx;
if (master->flags & (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX)) {
max_tx = 0;
max_rx = 0;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if ((master->flags & SPI_MASTER_MUST_TX) &&
!xfer->tx_buf)
max_tx = max(xfer->len, max_tx);
if ((master->flags & SPI_MASTER_MUST_RX) &&
!xfer->rx_buf)
max_rx = max(xfer->len, max_rx);
}
if (max_tx) {
tmp = krealloc(master->dummy_tx, max_tx,
GFP_KERNEL | GFP_DMA);
if (!tmp)
return -ENOMEM;
master->dummy_tx = tmp;
memset(tmp, 0, max_tx);
}
if (max_rx) {
tmp = krealloc(master->dummy_rx, max_rx,
GFP_KERNEL | GFP_DMA);
if (!tmp)
return -ENOMEM;
master->dummy_rx = tmp;
}
if (max_tx || max_rx) {
list_for_each_entry(xfer, &msg->transfers,
transfer_list) {
if (!xfer->tx_buf)
xfer->tx_buf = master->dummy_tx;
if (!xfer->rx_buf)
xfer->rx_buf = master->dummy_rx;
}
}
}
return __spi_map_msg(master, msg);
}
/*
* spi_transfer_one_message - Default implementation of transfer_one_message()