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spi/spi-pl022: Don't allocate more sg than required.

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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>
This commit is contained in:
Viresh Kumar 2011-08-10 17:12:11 +05:30 committed by Grant Likely
parent 538a18dc18
commit b181565ee6
1 changed files with 1 additions and 1 deletions
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drivers/spi/spi-pl022.c
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@ -1016,7 +1016,7 @@ static int configure_dma(struct pl022 *pl022)
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);