Applied "spi: davinci: do not use DMA for vmalloc'ed buffers" to the spi tree
broonie at kernel.org
Wed Mar 15 12:37:11 PDT 2017
spi: davinci: do not use DMA for vmalloc'ed buffers
has been applied to the spi tree at
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>From 4dd9becbce4f10009322c3e2297f9db3ace94a10 Mon Sep 17 00:00:00 2001
From: Frode Isaksen <fisaksen at baylibre.com>
Date: Thu, 23 Feb 2017 19:02:00 +0100
Subject: [PATCH] spi: davinci: do not use DMA for vmalloc'ed buffers
Using vmalloc'ed buffers will fail since daVinci has
VIVT cache and only the kernel lowmem virtual address
is invalidated/flushed when performing DMA.
The virtual address returned from vmalloc() is not
invalidated/flushed and may contain stale data when
returning from spi_sync().
Fixes errors when running UBIFS over SPI NOR.
Revert this when all upper layer users of vmalloc'ed
buffers sent to SPI handles cache flushing/invalidating.
Signed-off-by: Frode Isaksen <fisaksen at baylibre.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
drivers/spi/spi-davinci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 75c658e4e487..f37bbdd18d61 100644
@@ -482,7 +482,9 @@ static bool davinci_spi_can_dma(struct spi_master *master,
can_dma = (spicfg->io_type == SPI_IO_TYPE_DMA) &&
- (xfer->len >= DMA_MIN_BYTES);
+ (xfer->len >= DMA_MIN_BYTES) &&
+ !is_vmalloc_addr(xfer->rx_buf) &&
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