wilc1000: Remove misleading USE_SPI_DMA macro

The USE_SPI_DMA macro name suggests that it could be set to 1 to
control whether or not SPI DMA should be used.  However, that's not
what it does.  If set to 1, it'll set the SPI messages'
"is_dma_mapped" flag to true, even though the tx/rx buffers aren't
actually DMA mapped by the driver.  In other words, setting this flag
to 1 will break the driver.

Best to clean up this confusion by removing the macro altogether.
There is no need to explicitly initialize "is_dma_mapped" because the
message is cleared to zero anyhow, so "is_dma_mapped" is set to false
by default.
Signed-off-by: David Mosberger-Tang <davidm@egauge.net>
Acked-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20211207002453.3193737-1-davidm@egauge.net

drivers/net/wireless/microchip/wilc1000/spi.c

@@ -99,8 +99,6 @@ static int wilc_spi_reset(struct wilc *wilc);
 #define DATA_PKT_LOG_SZ				DATA_PKT_LOG_SZ_MAX
 #define DATA_PKT_SZ				(1 << DATA_PKT_LOG_SZ)
 
-#define USE_SPI_DMA				0
-
 #define WILC_SPI_COMMAND_STAT_SUCCESS		0
 #define WILC_GET_RESP_HDR_START(h)		(((h) >> 4) & 0xf)
 
@@ -247,7 +245,6 @@ static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len)
 		memset(&msg, 0, sizeof(msg));
 		spi_message_init(&msg);
 		msg.spi = spi;
-		msg.is_dma_mapped = USE_SPI_DMA;
 		spi_message_add_tail(&tr, &msg);
 
 		ret = spi_sync(spi, &msg);
@@ -291,7 +288,6 @@ static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen)
 		memset(&msg, 0, sizeof(msg));
 		spi_message_init(&msg);
 		msg.spi = spi;
-		msg.is_dma_mapped = USE_SPI_DMA;
 		spi_message_add_tail(&tr, &msg);
 
 		ret = spi_sync(spi, &msg);
@@ -330,7 +326,6 @@ static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen)
 		memset(&msg, 0, sizeof(msg));
 		spi_message_init(&msg);
 		msg.spi = spi;
-		msg.is_dma_mapped = USE_SPI_DMA;
 
 		spi_message_add_tail(&tr, &msg);
 		ret = spi_sync(spi, &msg);