serial: pl011: Allocate TX DMA buffer from DMA capable memory

Allocating with __GFP_DMA avoids the need for bounce buffers Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
git-mirror · Nov 7, 2014 · 4c0be45 · 4c0be45
1 parent 144c29e
commit 4c0be45
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
@@ -988,7 +988,7 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
 	if (!uap->dmatx.chan)
 		return;
 
-	uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL);
+	uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL | __GFP_DMA);
 	if (!uap->dmatx.buf) {
 		dev_err(uap->port.dev, "no memory for DMA TX buffer\n");
 		uap->port.fifosize = uap->fifosize;