From:   David Mosberger-Tang <davidm@egauge.net>
Subject: [PATCH] wilc1000: Remove misleading USE_SPI_DMA macro
Date:   Tue, 07 Dec 2021 00:26:01 +0000 (UTC)
Message-Id: <20211207002453.3193737-1-davidm@egauge.net>
MIME-Version: 1.0
To:     Ajay Singh <ajay.kathat@microchip.com>
Cc:     Claudiu Beznea <claudiu.beznea@microchip.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        David Mosberger-Tang <davidm@egauge.net>
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Precedence: bulk

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>
---
 drivers/net/wireless/microchip/wilc1000/spi.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c
index 640850f989dd..1856525b9834 100644
--- a/drivers/net/wireless/microchip/wilc1000/spi.c
+++ b/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)
 
@@ -240,7 +238,6 @@ 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);
@@ -284,7 +281,6 @@ 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);
@@ -323,7 +319,6 @@ 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);
-- 
2.25.1