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

PATCH New Andrew Jackson 1 participant 1 message Nov 7, 2014

Subsystems (2)

TTY layer and serial drivers Arm primecell UART PL010 and PL011 drivers

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Andrew Jackson

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2014-11-07 14:14 UTC #0 lore raw

PATCH 1/5 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 <[email protected]>

---
 drivers/tty/serial/amba-pl011.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

drivers/tty/serial/amba-pl011.c +1 -1

index 8572f2a..a285196 100644
@@ -987,7 +987,7 @@ 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;

Signature · 1 line

1.7.1