diff options
| author |   Martin Sperl <kernel@martin.sperl.org> | 2015-09-10 09:32:14 +0000 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2015-09-10 11:09:16 +0100 |
| commit | 2a3fffd45822070309bcf0b1e1dae624d633824a (patch) | |
| tree | fedfb018c3582f5996e9c83f7e382df8c4ee905a /drivers/spi/spi-bcm2835.c | |
| parent | Linux 4.2-rc1 (diff) | |
| download | linux-dev-2a3fffd45822070309bcf0b1e1dae624d633824a.tar.xz linux-dev-2a3fffd45822070309bcf0b1e1dae624d633824a.zip | |
spi: bcm2835: BUG: fix wrong use of PAGE_MASK
There is a bug in the alignment checking of transfers,
that results in DMA not being used for un-aligned
transfers that do not cross page-boundries, which is valid.
This is due to a missconception of the meaning PAGE_MASK
when implementing that check originally - (PAGE_SIZE - 1)
should have been used instead.
Also fixes a copy/paste error.
Reported-by: <robert@axium.co.nz>
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/spi/spi-bcm2835.c')
| -rw-r--r-- | drivers/spi/spi-bcm2835.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c index 59705ab23577..ed74786e68cb 100644 --- a/drivers/spi/spi-bcm2835.c +++ b/drivers/spi/spi-bcm2835.c @@ -386,14 +386,14 @@ static bool bcm2835_spi_can_dma(struct spi_master *master, /* otherwise we only allow transfers within the same page * to avoid wasting time on dma_mapping when it is not practical */ - if (((size_t)tfr->tx_buf & PAGE_MASK) + tfr->len > PAGE_SIZE) { + if (((size_t)tfr->tx_buf & (PAGE_SIZE - 1)) + tfr->len > PAGE_SIZE) { dev_warn_once(&spi->dev, "Unaligned spi tx-transfer bridging page\n"); return false; } - if (((size_t)tfr->rx_buf & PAGE_MASK) + tfr->len > PAGE_SIZE) { + if (((size_t)tfr->rx_buf & (PAGE_SIZE - 1)) + tfr->len > PAGE_SIZE) { dev_warn_once(&spi->dev, - "Unaligned spi tx-transfer bridging page\n"); + "Unaligned spi rx-transfer bridging page\n"); return false; } |