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spi: img-spfi: Verify max spfi transfer length

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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>
This commit is contained in:
Sifan Naeem 2015-03-02 16:06:46 +00:00 committed by Mark Brown
parent c517d838eb
commit f165ed6337
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/spi-img-spfi.c
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@ -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.