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authorSifan Naeem <sifan.naeem@imgtec.com>2015-03-02 17:06:46 +0100
committerMark Brown <broonie@kernel.org>2015-03-03 15:26:34 +0100
commitf165ed63370cfcc3a459cbd855822559f375a538 (patch)
tree317c7a3c358c80495ea7976204db3000d6c578d0 /drivers/spi
parentLinux 4.0-rc1 (diff)
downloadlinux-f165ed63370cfcc3a459cbd855822559f375a538.tar.xz
linux-f165ed63370cfcc3a459cbd855822559f375a538.zip
spi: img-spfi: Verify max spfi transfer length
Maximum transfer length supported by SPFI is 65535, this is limited by the number of bits available in SPFI TSize register to represent the transfer size. For transfer requests larger than the maximum supported the driver will return an invalid argument error. Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com> Reviewed-by: Andrew Bresticker <abrestic@chromium.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-img-spfi.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index c01567d53581..e649bc7d4c08 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -459,6 +459,13 @@ static int img_spfi_transfer_one(struct spi_master *master,
unsigned long flags;
int ret;
+ if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) {
+ dev_err(spfi->dev,
+ "Transfer length (%d) is greater than the max supported (%d)",
+ xfer->len, SPFI_TRANSACTION_TSIZE_MASK);
+ return -EINVAL;
+ }
+
/*
* Stop all DMA and reset the controller if the previous transaction
* timed-out and never completed it's DMA.