diff options
author | Ben Nizette <bn@niasdigital.com> | 2009-12-14 22:20:20 -0800 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2009-12-17 08:57:07 -0700 |
commit | 6aed4ee9b4610cd1e0315c90855b32e59ee81a15 (patch) | |
tree | 5866dec5080de784cb01ce3a6426a8d4d111636e /drivers/spi/Makefile | |
parent | bec0806cfec6ded1a7e097bb95279e521a796129 (diff) |
atmel_spi: fix dma addr calculation for len > BUFFER_SIZE
If len > BUFFER_LEN and !xfer->rx_buf we end up calculating the tx buffer
address as
*tx_dma = xfer->tx_dma + xfer->len - BUFFER_SIZE;
which is constant; i.e. we just send the last BUFFER_SIZE data over again
until we've reached the right number of bytes.
This patch gets around this by using the /requested/ length when
calculating addresses.
Note there's no way len != *plen when we calculate the rx buffer address
but conceptually we should be using *plen and I don't want someone to come
through later, see the calculations for rx and tx are different and "clean
up" back to what we had.
Signed-off-by: Ben Nizette <bn@niasdigital.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/Makefile')
0 files changed, 0 insertions, 0 deletions