wl12xx: allocate buffer spi read/write command buffer kzalloc()

Needed for DMA safe transfers.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 20 insertions, 15 deletions

diff --git a/drivers/net/wireless/wl12xx/spi.c b/drivers/net/wireless/wl12xx/spi.c
index fb7c52c4d9c..939274291a0 100644
--- a/drivers/net/wireless/wl12xx/spi.c
+++ b/drivers/net/wireless/wl12xx/spi.c
@@ -263,17 +263,19 @@ void wl12xx_spi_read(struct wl12xx *wl, int addr, void *buf,
         struct spi_transfer t[3];
         struct spi_message m;
         char busy_buf[TNETWIF_READ_OFFSET_BYTES];
-        u32 cmd;
+        u32 *cmd;
 
-        cmd = 0;
-        cmd |= WSPI_CMD_READ;
-        cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
-        cmd |= addr & WSPI_CMD_BYTE_ADDR;
+        cmd = &wl->buffer_cmd;
+
+        *cmd = 0;
+        *cmd |= WSPI_CMD_READ;
+        *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+        *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 
         spi_message_init(&m);
         memset(t, 0, sizeof(t));
 
-        t[0].tx_buf = &cmd;
+        t[0].tx_buf = cmd;
         t[0].len = 4;
         spi_message_add_tail(&t[0], &m);
 
@@ -290,7 +292,7 @@ void wl12xx_spi_read(struct wl12xx *wl, int addr, void *buf,
 
         /* FIXME: check busy words */
 
-        wl12xx_dump(DEBUG_SPI, "spi_read cmd -> ", &cmd, sizeof(cmd));
+        wl12xx_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
         wl12xx_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
 }
 
@@ -299,18 +301,20 @@ void wl12xx_spi_write(struct wl12xx *wl, int addr, void *buf,
 {
         struct spi_transfer t[2];
         struct spi_message m;
-        u32 cmd;
+        u32 *cmd;
 
-        cmd = 0;
-        cmd |= WSPI_CMD_WRITE;
-        cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
-        cmd |= addr & WSPI_CMD_BYTE_ADDR;
+        cmd = &wl->buffer_cmd;
+
+        *cmd = 0;
+        *cmd |= WSPI_CMD_WRITE;
+        *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+        *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 
         spi_message_init(&m);
         memset(t, 0, sizeof(t));
 
-        t[0].tx_buf = &cmd;
-        t[0].len = sizeof(cmd);
+        t[0].tx_buf = cmd;
+        t[0].len = sizeof(*cmd);
         spi_message_add_tail(&t[0], &m);
 
         t[1].tx_buf = buf;
@@ -319,7 +323,7 @@ void wl12xx_spi_write(struct wl12xx *wl, int addr, void *buf,
 
         spi_sync(wl->spi, &m);
 
-        wl12xx_dump(DEBUG_SPI, "spi_write cmd -> ", &cmd, sizeof(cmd));
+        wl12xx_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
         wl12xx_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
 }
 
diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index f252a118925..58659356351 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -384,6 +384,7 @@ struct wl12xx {
         struct wl12xx_debugfs debugfs;
 
         u32 buffer_32;
+        u32 buffer_cmd;
 };
 
 int wl12xx_plt_start(struct wl12xx *wl);