Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
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@@ -289,7 +289,7 @@ extern struct spi_master *spi_busnum_to_master(u16 busnum);
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* the data being transferred; that may reduce overhead, when the
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* underlying driver uses dma.
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*
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* If the transmit buffer is null, undefined data will be shifted out
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* If the transmit buffer is null, zeroes will be shifted out
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* while filling rx_buf. If the receive buffer is null, the data
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* shifted in will be discarded. Only "len" bytes shift out (or in).
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* It's an error to try to shift out a partial word. (For example, by
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