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

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Date:	Tue, 13 Apr 2010 13:31:55 +0200
From:	Anders Larsen <al@...rsen.net>
To:	linux-mtd@...ts.infradead.org
Cc:	Ian McDonnell <ian@...ghtstareng.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Matthias Kaehlcke <matthias@...hlcke.net>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Nicolas Pitre <nico@...xnic.net>, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix Oops with Atmel SPI

Tweak MTD's cache allocation to make it work with the atmel DMA'ed SPI.
Substitute kmalloc for vmalloc so the cache buffer is mappable as per
the Atmel SPI driver's requirements, otherwise an Oops would occur.

The original patch by Ian McDonnell <ian@...ghtstareng.com> was found here:
http://lists.infradead.org/pipermail/linux-mtd/2007-December/020184.html

Signed-off-by: Anders Larsen <al@...rsen.net>
Cc: Ian McDonnell <ian@...ghtstareng.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Matthias Kaehlcke <matthias@...hlcke.net>
Cc: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Cc: Nicolas Pitre <nico@...xnic.net>
---
 drivers/mtd/mtdblock.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: b/drivers/mtd/mtdblock.c
===================================================================
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -253,7 +253,11 @@ static int mtdblock_writesect(struct mtd
 {
 	struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {
+#ifdef CONFIG_SPI_ATMEL
+		mtdblk->cache_data = kmalloc(mtdblk->mtd->erasesize, GFP_KERNEL);
+#else
 		mtdblk->cache_data = vmalloc(mtdblk->mtd->erasesize);
+#endif
 		if (!mtdblk->cache_data)
 			return -EINTR;
 		/* -EINTR is not really correct, but it is the best match
@@ -322,7 +326,11 @@ static int mtdblock_release(struct mtd_b
 		mtdblks[dev] = NULL;
 		if (mtdblk->mtd->sync)
 			mtdblk->mtd->sync(mtdblk->mtd);
+#ifdef CONFIG_SPI_ATMEL
+		kfree(mtdblk->cache_data);
+#else
 		vfree(mtdblk->cache_data);
+#endif
 		kfree(mtdblk);
 	}
 

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