linux-kernel - Re: [PATCH] Fix Oops with Atmel SPI

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Date:	Wed, 19 May 2010 13:05:00 +0200
From:	Anders Larsen <al@...rsen.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Iwo Mergler <iwo@...l-direct.com.au>,
	linux-mtd@...ts.infradead.org,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Ian McDonnell <ian@...ghtstareng.com>,
	Nicolas Pitre <nico@...xnic.net>, linux-kernel@...r.kernel.org,
	Matthias Kaehlcke <matthias@...hlcke.net>,
	David Woodhouse <dwmw2@...radead.org>,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: Re: [PATCH] Fix Oops with Atmel SPI

On 2010-04-22 00:24:10, Andrew Morton wrote:
> Finally..  Wouldn't it be better to just fix the atmel SPI driver so
> that it doesn't barf when handed vmalloc'ed memory?  Who do we ridicule
> about that?  <checks, adds cc>

You mean something like this instead?

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index c4e0442..a9ad5e8 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -352,16 +352,30 @@ atmel_spi_dma_map_xfer(struct atmel_spi *as, struct spi_transfer *xfer)
 
 	xfer->tx_dma = xfer->rx_dma = INVALID_DMA_ADDRESS;
 	if (xfer->tx_buf) {
-		xfer->tx_dma = dma_map_single(dev,
-				(void *) xfer->tx_buf, xfer->len,
-				DMA_TO_DEVICE);
+		if (is_vmalloc_addr(xfer->tx_buf))
+			xfer->tx_dma = dma_map_page(dev,
+					vmalloc_to_page(xfer->tx_buf),
+					(unsigned long)xfer->tx_buf & (PAGE_SIZE-1),
+					xfer->len,
+					DMA_TO_DEVICE);
+		else
+			xfer->tx_dma = dma_map_single(dev,
+					(void *) xfer->tx_buf, xfer->len,
+					DMA_TO_DEVICE);
 		if (dma_mapping_error(dev, xfer->tx_dma))
 			return -ENOMEM;
 	}
 	if (xfer->rx_buf) {
-		xfer->rx_dma = dma_map_single(dev,
-				xfer->rx_buf, xfer->len,
-				DMA_FROM_DEVICE);
+		if (is_vmalloc_addr(xfer->rx_buf))
+			xfer->rx_dma = dma_map_page(dev,
+					vmalloc_to_page(xfer->rx_buf),
+					(unsigned long)xfer->rx_buf & (PAGE_SIZE-1),
+					xfer->len,
+					DMA_FROM_DEVICE);
+		else
+			xfer->rx_dma = dma_map_single(dev,
+					xfer->rx_buf, xfer->len,
+					DMA_FROM_DEVICE);
 		if (dma_mapping_error(dev, xfer->rx_dma)) {
 			if (xfer->tx_buf)
 				dma_unmap_single(dev,

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