spi/spi-pl022: Don't allocate more sg than required.
In routine configure_dma(), if transfer->len = PAGE_SIZE, then pages is one more
than required. While leads to one more sg getting allocated.
This is wrong. Correct this to allocate correct number of sg.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 01e9aa4..248674c 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1016,7 +1016,7 @@
dmaengine_slave_config(txchan, &tx_conf);
/* Create sglists for the transfers */
- pages = (pl022->cur_transfer->len >> PAGE_SHIFT) + 1;
+ pages = DIV_ROUND_UP(pl022->cur_transfer->len, PAGE_SIZE);
dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages);
ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_ATOMIC);